The Hardest Words to Spell
The hardest words in English are hard for a reason you can name — a silent letter, a spelling borrowed whole from another language, or a run of vowels English gives you no pattern for — and naming the reason is what makes them learnable.
Fifteen words, each with what makes it hard and the way in.
Practice these words
Words this hard need spacing, not cramming. SpellCrush brings a word back a day later, then three days later, then a week later, and drops it out of rotation once it sticks.
One honest caveat. Practice is word-by-word: there is no mode yet that shows a sentence with a gap and asks which spelling fits. Everything else is the real session — each word read aloud, its picture, its definition, a hint, three attempts and instant feedback.
A hard word is not the same as a long word. Extraordinary is long and perfectly regular. Rhythm is six letters and nearly impossible, because the sound gives you no useful information about the letters. The words below are the second kind.
Nearly all of them yield to the same move: find the join. Long words in English are usually two shorter things joined together, often from Latin, Greek or French. Once you can see the seam, you are spelling two easy words instead of one impossible one.
Fifteen genuinely hard words
accommodate
Why it is hard: Two separate doubled letters, and nothing in the sound tells you either one is there.
The way in: It accommodates two c's and two m's — the word is generous, so the spelling is too.
rhythm
Why it is hard: Six letters, one vowel sound, and that sound is spelled with a y.
The way in: Rhythm Helps Your Two Hips Move.
colonel
Why it is hard: It is pronounced kernel. The written and spoken forms come from two different languages and never reconciled.
The way in: Remember it as colon plus el, and accept that the pronunciation is Spanish while the spelling is French.
onomatopoeia
Why it is hard: Five vowels in a row at the end, in an order English gives you no help with.
The way in: Break it into on-o-mat-o-poe-ia and learn poe as a chunk, like the poet.
bureaucracy
Why it is hard: The French eau at the front, then a Greek ending, in one word.
The way in: Spell bureau first, then add cracy. Two known words, one hard one.
conscientious
Why it is hard: It contains sci once and ti once, and both make a sh sound.
The way in: Build it from conscience, then swap the ending: conscien plus tious.
liaison
Why it is hard: Three vowels in a row with no pattern behind them.
The way in: li-ai-son. Say those three chunks out loud as you write.
questionnaire
Why it is hard: The double n is French and there is no way to hear it.
The way in: Question plus naire, and naire always doubles the n.
handkerchief
Why it is hard: A silent d in the middle of a compound that no longer looks like its parts.
The way in: It is hand plus kerchief. Once you see the join, the d is obvious.
mnemonic
Why it is hard: It starts with a silent m, which is unique in everyday English.
The way in: The word for a memory trick is itself the hardest one to remember. From Mnemosyne, the Greek goddess of memory.
sacrilegious
Why it is hard: Everyone assumes it is built from religious. It is not.
The way in: It comes from sacrilege, so the i and e are the other way round: sacri-leg-ious.
pharaoh
Why it is hard: The ao ending is in an order almost nothing else in English uses.
The way in: Phara plus oh. Finish it by saying oh out loud.
chiaroscuro
Why it is hard: An Italian art term that keeps its Italian spelling whole.
The way in: chiaro (light) plus scuro (dark). Learning the two Italian words fixes it.
logorrhea
Why it is hard: The double r plus h cluster, and a national spelling bee word for that reason.
The way in: Same rrh as in diarrhea and hemorrhage — Greek rhein, to flow.
weltschmerz
Why it is hard: A German loanword with a consonant run English never produces.
The way in: Welt (world) plus schmerz (pain). Split it at the join.
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Frequently asked
What is the hardest word to spell in English?
There is no single answer, but the words that come up again and again are rhythm, colonel, onomatopoeia, bureaucracy and accommodate. Each is hard for a different reason: rhythm has almost no vowels, colonel is pronounced nothing like it is written, and accommodate hides two doubled letters you cannot hear.
Why is colonel spelled that way?
Because English borrowed the word twice. The spelling came from French colonel, while the pronunciation came from an older Italian and Spanish form, coronel, with an r. The two versions never merged, so we write one word and say another. It is the clearest example in English of a spelling that carries its history rather than its sound.
How do you learn to spell very difficult words?
Break them at the join and learn the pieces. Bureaucracy is bureau plus cracy, handkerchief is hand plus kerchief, chiaroscuro is two Italian words meaning light and dark. Almost every long, frightening word is two or three shorter things stuck together, and the pieces are far easier to hold than the whole.
Are these the words used in spelling bees?
Several of them, yes — logorrhea and weltschmerz are both championship-round material. Competition words go much further into borrowed vocabulary, which is why bee preparation focuses on language of origin: knowing a word is German tells you far more about its spelling than sounding it out ever will.