Cop vs cup: how to say the American /ɑ/ and /ʌ/ vowels

Published November 3, 2026

If “cop” and “cup” sound like the same word to you, you’re not alone. Many languages have only one vowel in this area of the mouth, so the ear files both American sounds under a single category. The good news is that the difference is mostly about how far your jaw drops, and you can train your ear to notice it.

The /ɑ/ in “cop”

This is the vowel in cop, hot, and stop. Drop your jaw and open your mouth wide, with your tongue low and pulled slightly back. It’s the sound you make when a doctor asks you to say “ah”.

The /ʌ/ in “cup”

This is the vowel in cup, luck, and but. Keep your mouth only slightly open, with your jaw and tongue relaxed in the middle. It’s shorter and less effortful than /ɑ/.

Word pairs to practice

Watch out for spelling

Spelling is an unreliable guide here. The letter “o” usually gives /ɑ/ in short words like hot, but /ʌ/ in common words like love, come, son, and money. The spelling “ou” can also give /ʌ/, as in young and touch.

How to practice

1. Say each pair slowly in front of a mirror. Your jaw should visibly drop more for /ɑ/.
2. Record yourself, then compare your recording with a native speaker’s audio.
3. Try the pairs in a sentence: “He shot the door” and “He shut the door.”
4. Practice a little every day. Short, regular sessions help your ear adjust.