Hard Words to Spell: 100 Commonly Misspelled Words

There’s a reason “accommodate” tops nearly every list of commonly misspelled words: those double letters throw off even experienced writers. English spelling is full of traps like silent letters, French influence, and irregular vowel pairs.

Number of commonly misspelled words in standard lists: 100 ·
Most frequently cited #1 misspelled word: accommodate ·
Percentage of misspellings involving double letters: 40% (estimated) ·
Common silent letter words count: 20 ·
Hardest words for spelling bee champions: 10 ·
Words from French origin in top 100 misspelled: ~25

Five facts from the data, one pattern: double letters and silent letters dominate the most common misspellings across every major list.

What are the 100 most misspelled words?

Overview of common misspelling patterns

• Double-letter traps (accommodate, embarrass, millennium)
• Silent letters (rhythm, knowledge, psychology)
• French loanword spellings (boulevard, camouflage, bureaucracy)
• Unusual vowel combinations (conscientious, seize, weird)

Multiple published lists of 100 commonly misspelled words exist, including those from EnglishClub, BYJU’S, and Greenlight. The lists share a core of about 30 words that appear in nearly every collection, with double-letter words dominating the first quartile. According to EnglishClub, the patterns include “i before e” exceptions, double consonants, silent letters, and common suffix errors.

Top entries from dictionary.com and 98thpercentile lists

• accommodate, millennium, separate, calendar, argument, definite, cemetery, fluorescent, necessary, pronunciation — from Study.com
• acquire, address, amateur, argument, atheist, awful — from Wikipedia
• accommodate, achieve, across, aggressive, apparently, appearance, argument, assassination, basically, beginning — from EnglishClub

The overlap between these lists is striking. Words like “accommodate,” “necessary,” and “embarrass” appear on all three, reinforcing the idea that certain spelling traps are universal — not limited to one age group or region. The implication: if you’re struggling with a word on one list, it’s almost certainly on the others too.

What are the 10 hardest words to spell?

Accommodate

• Double ‘c’ and double ‘m’ — the twin trap
• Consistently cited as the #1 misspelled word by EnglishClub, Study.com, and Greenlight

“Accommodate” has two pairs of double letters, but the first pair is the most common point of failure. Many people write “acommodate” or “accomodate,” dropping one ‘c’ or one ‘m’. The rule: the prefix “ac-” plus “commodate” yields four consonants in sequence.

Narcissistic

• Two sets of double letters: ‘c’ and ‘s’
• Often misspelled as “narcisistic” or “narcissitic”

This word has a double ‘c’ in the middle and a double ‘s’ at the end, making it a rare double-double. According to EnglishClub, such words are particularly prone to error because the double letters are not adjacent and the stress pattern can obscure them.

Boulevard

• French origin with silent ‘e’ and unusual vowel combination ‘ou’
• Common misspellings: “boulevarde,” “bullevard”

Boulevard comes from French, where the spelling follows different rules. The silent ‘e’ at the end confuses writers who expect a phonetic pronunciation. The EnglishClub list confirms this word as a frequent error among adult learners.

Conscientious

• 14 letters, making it the longest word in the top 100
• Contains ‘sc’ combination and ‘tious’ ending

This word is a nightmare of silent letters and unusual letter pairs. The ‘sc’ in the middle is pronounced as ‘sh’, and the ‘tious’ ending is common in English (e.g., “ambitious”), but the spelling is not intuitive. EnglishClub lists it as one of the most challenging.

Pronunciation

• Often confused with “pronounciation” (the verb is “pronounce”)
• The ‘nun’ syllable is not spelled as it sounds

This word is tricky because the verb “pronounce” has a ‘noun’ sound, but the noun “pronunciation” drops the ‘o’. Study.com includes it in the top 10 hardest.

Other top contenders

• Separate (often misspelled as “seperate”)
• Definitely (often “definately” or “defiantly”)
• Embarrass (double ‘r’ and double ‘s’)
• Millennium (double ‘l’ and double ‘n’)

The exact ordering of the top 10 varies by source, but these six words appear in nearly every ranking. The pattern: they all contain double letters or silent letters, and they’re all words people use frequently in writing, which increases the chance of error.

What is the #1 misspelled word?

Why ‘accommodate’ is most frequently misspelled

• Two sets of double letters: ‘c’ and ‘m’
• Most people miss one of the double letters
• Consistently ranked #1 by EnglishClub, Study.com, and Greenlight

Accommodate is the undisputed champion of misspelling. According to EnglishClub, it appears at the top of nearly every list because it violates the common expectation that only one letter can be doubled in a row. The word actually has two separate double-letter pairs: ‘cc’ and ‘mm’.

The double ‘c’ and double ‘m’ trap

• The prefix “ac-” adds one ‘c’ to the root “commodate”
• Many people write “accomodate” (one ‘m’) or “acommodate” (one ‘c’)

The spelling rule for double consonants in English is inconsistent, but “accommodate” follows the pattern of Latin-derived words where the prefix “ad-” assimilates to “ac-” before a root starting with ‘c’, and the root itself has a double ‘m’. A mnemonic: “A c-c-o-m-m-o-d-a-t-e — two c’s, two m’s, one date.”

What are 20 tricky words?

Words with silent letters

• rhythm (silent ‘h’ and ‘y’)
• knowledge (silent ‘k’)
• psychology (silent ‘p’)
• doubt (silent ‘b’)
• receipt (silent ‘p’)
• island (silent ‘s’)
• knight (silent ‘k’ and ‘gh’)

These words are not phonetically regular, which is why they’re tricky. According to Greenlight, silent letters are a leading cause of misspellings, accounting for about 20% of all errors in common lists. The silent letters often come from older pronunciations that have since changed.

Words with unusual vowel pairings

• seize (exception to “i before e”)
• weird (exception to “i before e”)
• leisure (exception to “i before e”)
• conscientious (unusual ‘sc’ sound)
• pronunciation (different from “pronounce”)

The “i before e except after c” rule has many exceptions, and these words are among the most common. EnglishClub notes that “seize” and “weird” are frequently misspelled as “sieze” and “wierd” because writers follow the rule that doesn’t apply.

Homophones and near-homophones

• their/there/they’re
• to/too/two
• accept/except
• affect/effect
• principle/principal

While not technically spelling errors, homophone confusion is a major source of mistakes in adult writing. The Cambridge Dictionary includes these in its top 50 spelling mistakes for learners, noting that they require context-based correction rather than memorization.

What are 20 silent words?

Examples of silent letters: ‘k’ in know, ‘p’ in psychology

• k: know, knead, knight, knock, knee
• p: psychology, pseudo, pneumonia, receipt, corps
• b: doubt, debt, subtle, thumb, bomb
• h: rhythm, ghost, honest, hour, exhibit
• w: write, wrong, sword, answer, whole

Silent letters are a legacy of English’s mixed origins. According to Greenlight, words of Greek origin (like “psychology”) often have silent ‘p’, while Germanic words (like “knight”) have silent ‘k’ and ‘gh’. The silent ‘b’ in “doubt” comes from Latin “dubitare,” where the ‘b’ was originally pronounced but later dropped in English.

Common silent letter words for spelling practice

• aisle (silent ‘s’)
• gnome (silent ‘g’)
• subtle (silent ‘b’)
• island (silent ‘s’)
• receipt (silent ‘p’)
• rhythm (silent ‘h’)
• knowledge (silent ‘k’)
• psychology (silent ‘p’)
• doubt (silent ‘b’)

These words appear in nearly every list of commonly misspelled words, and they share a common feature: the silent letter is a remnant of the word’s etymology. The catch: you can’t rely on pronunciation to spell them correctly. Mnemonics like “I have a doubt about the ‘b'” or “The ‘k’ in ‘knowledge’ is silent, but not the ‘d’ in ‘edge'” can help.

The implication for a learner: focus on the few patterns that appear in every list, and accept that some variation across sources is inevitable.

The data is clear: spelling errors aren’t random — they cluster around a few recurring patterns. For adult writers and learners, the path to improvement lies in recognizing these patterns rather than memorizing every word. The trade-off is simple: spend 10 minutes learning the double-letter and silent-letter rules, and you’ll eliminate the majority of common mistakes. A writer who masters these patterns can confidently reduce errors in professional and academic writing without memorizing hundreds of individual words.

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