cap vs cup: hear and say the difference
cap and cup are identical except for one sound: cap has the short a, /æ/, and cup has the short u, /ʌ/. Short A drops the jaw and pushes the tongue forward and low; short U leaves everything slack in the middle of the mouth and barely opens the jaw.
The two words
The difference
What actually changes
Short A drops the jaw and pushes the tongue forward and low; short U leaves everything slack in the middle of the mouth and barely opens the jaw.cap — /æ/
- Lips
- Spread wide and flat.
- Tongue
- Front and low — the lowest of the front vowels.
- Jaw
- Dropped noticeably; you can fit a finger between your teeth.
cup — /ʌ/
- Lips
- Completely neutral — no spreading, no rounding.
- Tongue
- Central and mid, doing almost nothing.
- Jaw
- Open about half a finger's width.
Each word in a sentence
cap
Put the cap back on the bottle.
cup
Pour the milk into that cup.
Why this pair is hard
Spanish, Italian and Japanese have a single a that sits between the two, so 'cat' and 'cut' converge on it. French and Russian have a central a, so 'cat' drifts toward 'cut' unless the tongue is pushed forward. Hindi, Urdu, Mandarin and Vietnamese have a central vowel close to the English short U, so that side is secure and the front one needs the jaw.
Straight answers
What is the difference between "cap" and "cup"?
One sound. cap is /kæp/ and cup is /kʌp/ — everything else in the two words is identical, so that single contrast carries the whole meaning. Short A drops the jaw and pushes the tongue forward and low; short U leaves everything slack in the middle of the mouth and barely opens the jaw.
Why do I say "cap" and "cup" the same way?
Spanish, Italian and Japanese have a single a that sits between the two, so 'cat' and 'cut' converge on it. French and Russian have a central a, so 'cat' drifts toward 'cut' unless the tongue is pushed forward. Hindi, Urdu, Mandarin and Vietnamese have a central vowel close to the English short U, so that side is secure and the front one needs the jaw.
Should I train my ear or my mouth first?
Your ear. If you cannot reliably hear which word was said, your mouth has no target to aim at, and drilling produces a sound you cannot check. Run the listening test on this page until you are scoring four or five out of five, then record the pair.
Say "cap" and "cup" and see which one you said
One take covers both words: reference mode aligns each sound against its target, so the contrast comes back scored on both sides. Free, private, in your browser.