proof vs prove: hear and say the difference
proof and prove are identical except for one sound: proof has the f sound, /f/, and prove has the v sound, /v/. The mouth is identical — top teeth on the bottom lip — and only the voice changes: put a hand on your throat and V buzzes while F is silent.
The two words
The difference
What actually changes
The mouth is identical — top teeth on the bottom lip — and only the voice changes: put a hand on your throat and V buzzes while F is silent.proof — /f/
- Lips
- Bottom lip drawn up lightly under the top teeth.
- Tongue
- Free and low — it does nothing.
- Jaw
- Nearly closed.
prove — /v/
- Lips
- Bottom lip under the top teeth — the same contact as F.
- Tongue
- Low and uninvolved.
- Jaw
- Nearly closed.
Each word in a sentence
proof
There is no proof of that.
prove
You will have to prove it.
Why this pair is hard
Hindi, Urdu, Punjabi, Gujarati and Telugu merge v with w, so V drifts away from the teeth. Bengali, Japanese, Korean and Mandarin have no v and substitute b or w. Arabic has no v and uses f, which collapses the pair entirely. German devoices a final consonant, so 'leave' can end like 'leaf'.
Straight answers
What is the difference between "proof" and "prove"?
One sound. proof is /pruːf/ and prove is /pruːv/ — everything else in the two words is identical, so that single contrast carries the whole meaning. The mouth is identical — top teeth on the bottom lip — and only the voice changes: put a hand on your throat and V buzzes while F is silent.
Why do I say "proof" and "prove" the same way?
Hindi, Urdu, Punjabi, Gujarati and Telugu merge v with w, so V drifts away from the teeth. Bengali, Japanese, Korean and Mandarin have no v and substitute b or w. Arabic has no v and uses f, which collapses the pair entirely. German devoices a final consonant, so 'leave' can end like 'leaf'.
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 "proof" and "prove" 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.