Silent Letters

What Is a Silent Letter?

A silent letter is a letter that is written as part of a word’s correct spelling but contributes no sound when the word is spoken. Say wrap out loud slowly: the word begins with the /r/ sound — there’s no /w/ sound anywhere in it — yet wrap is spelled with a w before the r. That w is silent. The same thing happens with the k in know (said “noh,” with no /k/ sound) and the b at the end of thumb (said “thum,” with no /b/ sound).

This matters because it separates two things that feel like the same skill but aren’t: sounding out a word, and spelling a word. A child who sounds out wrap carefully and accurately will hear /r/-/a/-/p/ — and still spell it wrong if they write only the sounds they hear. Silent letters are the clearest case where spelling by ear alone isn’t enough; the letter has to be remembered as part of the word, not decoded from the sound.

This page covers three specific silent-letter patterns that show up often in early reading and writing: wr at the start of a word, kn at the start of a word, and mb at the end of a word. Many other silent-letter patterns exist in English — some are named in the FAQ below — but grouping too many different patterns together makes each one harder to learn securely. Three clear, bounded patterns are easier to master than a long, mixed list. Unlike some spelling conventions, these three don’t come with a well-known list of exception words to watch for — once the pattern is learned, it applies reliably to new words that fit it.

WR Words: A Silent W Before R

At the start of a word, when the letters w and r appear together, the w is silent and the word begins with the /r/ sound alone.

Word	How it’s said	Silent letter
wrap	rap	w
wrist	rist (rhymes with fist)	w
write	rite	w

Dropping the silent w is the most common mistake, and with some wr words it does more than misspell the word — it spells a different real word instead. Leave the w off wrap and the result is rap, which is its own word (as in rap music, or a rap on the door). Leave it off write and the result, rite, is also a real word (a ceremonial rite), and sounds identical to another real word, right. This is worth naming directly: with wr words, a missing silent letter is sometimes not just “wrong” — it’s a different, correctly spelled word that doesn’t mean what the writer intended. Wrist doesn’t have this effect — “rist” isn’t a word — so the risk depends on the specific word, not on the wr pattern itself.

Write has a second silent letter working at the same time: the final e, which is part of a completely different pattern (see “How is this different from silent e?” below). Both silent letters belong to write’s correct spelling, but they aren’t the same kind of silent letter, and a child doesn’t need to understand the second one to learn the first.

KN Words: A Silent K Before N

At the start of a word, when the letters k and n appear together, the k is silent and the word begins with the /n/ sound alone.

Word	How it’s said	Silent letter
know	no	k
knee	nee	k
knot	not	k

Just like wr, dropping the silent k sometimes produces a different real word: know without its k is no, and knot without its k is not. Both pairs sound exactly alike, which makes them a useful thing to point out directly — a child who spells no when they mean know hasn’t just missed a letter, they’ve written a real, different word. Knee doesn’t have this effect — “nee” isn’t a word on its own — so, as with wrist, this particular risk depends on the word, not on the kn pattern as a whole.

MB Words: A Silent B After M

At the end of a one-syllable word, when the letters m and b appear together, the b is silent and the word ends with the /m/ sound alone.

Word	How it’s said	Silent letter
thumb	thum	b
lamb	lam	b
crumb	crum	b

This pattern works a little differently from wr and kn. Dropping the silent b usually produces a spelling that isn’t a word at all — thum and crum aren’t words — rather than a different real word. Lamb is a partial exception: lam is a real, if uncommon, word (an informal term for fleeing, as in “on the lam”), but it’s obscure enough that a child mixing up the two words is unlikely. The mistake is still worth catching, but the “you accidentally spelled a different, meaningful word” risk that makes wr and kn errors so noticeable mostly doesn’t apply here.

What Should the Learner Notice?

• The silent letter is never optional — it’s part of the word’s correct spelling even though it isn’t part of how the word sounds.
• In the words on this page, wr and kn appear at the start of the word, and mb appears at the end.
• Saying the word slowly doesn’t reveal the silent letter — it can only be learned by seeing and remembering the word’s spelling.
• With wr and kn words especially, leaving out the silent letter can spell a different real word, not just an incorrect one.

Common Silent-Letter Mistakes

The mistake children make almost always in the same direction: leaving the silent letter out entirely, because it isn’t heard. This is a reasonable strategy — it’s exactly how skilled sound-based spelling works everywhere else — and it’s precisely why wr, kn, and mb need to be taught as their own small, memorized patterns rather than sounded out.

A second, less common mistake is getting the silent letter’s position wrong rather than leaving it out — writing rwite for write, or nkow for know. This usually means the pattern (silent letter, then the sounded consonant) hasn’t been fully learned yet, even though the child correctly remembered that an extra letter belongs somewhere in the word.

A handful of wr, kn, and mb words are common enough — write, know, and thumb especially — that many children learn to write them correctly from memory well before they can explain why. That’s a normal and useful stepping stone, not a sign the pattern needs to be taught differently.

How to Practice Silent-Letter Words

1. Say the word slowly and clearly.
2. Ask: does this word start with wr or kn, or end with mb? Name the pattern before writing.
3. Write the word, including the silent letter, from memory.
4. Read back exactly what was written, letter by letter.
5. Check: is the silent letter there, and is it in the right place — before the sounded consonant for wr/kn, after the m for mb?

If a word comes out wrong, step 4 is the key one: read back exactly what was written and ask whether it spells the intended word, a different real word, or no word at all. For wr and kn words, that question often does the work by itself — a child who reads back “rap” when they meant “wrap” will usually notice the mismatch once it’s said aloud, without being told which letter is missing.

Signs Silent-Letter Words Are Becoming Secure

• Spelling a familiar wr, kn, or mb word correctly without sounding it out first.
• Noticing, without prompting, that leaving out the silent letter in a word like wrap or knot spells a different real word.
• Recognizing wr and kn at the start of an unfamiliar word and remembering that the first letter is silent.
• Explaining, in their own words, that some letters are part of a word’s spelling even though they aren’t part of how it sounds.

How Is This Different From Silent E?

Write highlights a real distinction worth being clear about: this page is not about the silent e at the end of words like make or hope. That’s a separate, unrelated pattern with its own page for each vowel (Long A Silent E Words, Long I Silent E Words, and so on) — in that specific pattern, the silent e isn’t a meaningless leftover; it’s doing a job, marking that the vowel before it says its own name. (Final silent e has other jobs in other English words too — keeping the c or g soft in dance or cage, for instance, or simply because English words don’t end in a bare v, as in have — but the vowel-marking kind is what the Silent E pages teach.) The w in write and the k in know don’t mark anything at all — they simply aren’t pronounced. A word can have both kinds of silent letter at once, as write does, without the two patterns having anything else in common.