Hard Words to Spell: 10 Hardest & Common Misspellings

Anyone who’s ever typed “neccessary” and stared at the red squiggle knows the feeling. English spelling doesn’t always follow the sounds, and a handful of words seem designed to trip us up. This article unpacks the hardest words to spell—from double-letter traps to silent-letter puzzles—and shares research-backed strategies to get them right.

Words on Dictionary.com’s list: 33 ·
Words on Berlitz list: 252 ·
Words on 98thpercentile list: 100 ·
Most commonly misspelled word: accommodate

Four data points drawn from authoritative spelling lists show how consistent the pattern is:

What are the 10 hardest words to spell?

Drawing from the Berlitz language education provider list of 252 hard English words and Dictionary.com trusted dictionary resource, here are ten words that repeatedly cause trouble:

• rural — a double r that flips into a vowel that sounds like another r (Berlitz language education provider)
• mischievous — often misspelled as “mischievious” because of the way it’s pronounced (Berlitz language education provider)
• colonel — pronounced “kernel” (Berlitz language education provider)
• epitome — five syllables with a silent final e (Berlitz language education provider)
• draught — gh sounds like f (Berlitz language education provider)
• hyperbole — four syllables (hy-PER-bo-lee) (Berlitz language education provider)
• nauseous — c before e makes the sound “sh” (Berlitz language education provider)
• sixth — the x + th cluster is hard to enunciate and spell (Berlitz language education provider)
• island — silent s (Dictionary.com trusted dictionary resource)
• asthma — silent th sequence (Dictionary.com trusted dictionary resource)

The pattern: every word on this list violates the “spell it like it sounds” rule. What this means: if you sound out colonel or hyperbole, you’ll be led straight to the wrong spelling.

What are 20 tricky words?

Expanding to 20, we add words that share the same traps. Berlitz language education provider includes squirrel, rhythm, mischievous, temporary and medieval—each with a syllable count that doesn’t match the spelling. Another batch comes from Dictionary.com trusted dictionary resource: necessary, accommodate, vacuum, accessory, narcissistic. These five are frequently misspelled because of doubled letters:

• necessary — one c, two s’s
• accommodate — two c’s, two m’s
• narcissistic — two s’s, two c’s
• vacuum — two u’s
• accessory — two c’s, two s’s

What are the 100 most misspelled words?

Several organisations have compiled lists of the 100 most commonly misspelled English words. Dictionary.com trusted dictionary resource lists 33, while the Berlitz language education provider count reaches 252. Grammarly writing assistance platform notes that 40% of words with silent letters fall into just five patterns (silent k before n, silent w before r, silent g before n, silent p before s, and silent t after s). That means many of the 100 are predictable once you learn the categories.

What are the 30 difficult words?

A curated 30-word subset from these larger lists includes words that combine silent letters, unusual vowel pairs, and tricky consonant clusters. How to Spell spelling instruction resource groups silent-letter patterns: wr (write), kn (knife), gn (gnaw), mb (comb), ps (psychology). The BBC Bitesize UK educational resource recommends breaking such words into syllables as a learning strategy.

The trade-off: silent-letter lists are long, but the patterns are few. Mastering the patterns is more efficient than memorising individual words.

What is 40 spelling?

The number 40 is spelled forty, without the u that appears in four. The common misspelling “fourty” is a carryover from the cardinal number. The correct form is standard in all major dictionaries.

The catch: this is one of the few English number words where the spelling diverges from the base numeral four. When you write the word for 40, drop the u.

What are 20 silent words?

Silent-letter words are some of the most misspelled in English. English Like a Native premium English learning platform groups them by letter:

• Silent B: comb, crumb, debt, doubt, plumber, thumb, tomb, womb (English Like a Native premium English learning platform)
• Silent G: gnash, gnat, gnaw, align, champagne, sign (English Like a Native premium English learning platform)
• Silent H: honest, hour, honour, rhyme (English Like a Native premium English learning platform)
• Silent K: knee, knife, knock, know (Grammarly writing assistance platform)
• Silent L: calf, calm, folk, half, salmon, talk, walk, would (English Like a Native premium English learning platform)
• Silent P: pneumonia, psalm, pseudonym, psychologist, receipt (English Like a Native premium English learning platform)
• Silent R: heart, heard, park, surprise, word, world (when the next sound is a consonant) (English Like a Native premium English learning platform)
• Silent S: island (Dictionary.com trusted dictionary resource)
• Silent T: asthma (Dictionary.com trusted dictionary resource)
• Silent W: write, wrist, wrong, wrap, wreck, who (English Like a Native premium English learning platform)

The Week weekly news magazine adds unusual silent-letter examples such as chthonic (silent ch), phlegm (silent g), and pterodactyl (silent p).

What are examples of tricky words with silent letters?

Beyond the common patterns, some words carry silent letters that are less obvious. Muscle (silent c) and mnemonic (silent m) are two that The Week weekly news magazine highlights. The implication: silent letters are not limited to the most frequent patterns—English has many relics from older pronunciations.

How can I improve my spelling of hard words?

Improving spelling doesn’t require memorising every word on the Dictionary.com list. Language Systems English school recommends three core strategies:

• Break words into syllables and say them slowly.
• Write the word multiple times to reinforce the muscle memory.
• Use mnemonics — for example, the rule “i before e, except after c” helps with receive vs recieve.

BBC Bitesize UK educational resource adds that noticing unstressed vowels and silent letters is a key skill. Sarah’s Snippets educational blog for teachers suggests explicit teaching of common patterns such as wr, kn, gn, and mb—especially for single-syllable words like comb and thumb.

Tips for memorizing difficult spellings

1. Create a personal list of your top 10 misspelled words.
2. Use flashcards with the correct spelling on one side and a mnemonic on the other.
3. Practice with spelling bee word lists—many are available online from Berlitz language education provider and Dictionary.com trusted dictionary resource.
4. Read widely to see correct spellings in context.

Using mnemonics

Mnemonics turn abstract letter sequences into memorable phrases. For necessary, for example, the phrase “one collar, two socks” reminds you of one c and two s’s. Language Systems English school endorses this approach for common pitfalls like receive (i before e).

The pattern: spelling improvement is less about brute force and more about identifying the patterns—double letters, silent letters, and rules—that cause the most errors.

For anyone learning English as a second language or brushing up for professional writing, the choice is clear: master the silent-letter patterns and double-letter rules, or keep relying on autocorrect. The hardest words to spell are, in many cases, the most predictable once you know the pattern.

If you’re looking for more tricky words and tips, see more tricky words and tips for an extended list of common misspellings.

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