Which is the difference in pronunciation between "won't" and "want"?
The vowels are pronounced differently in these two words.
In American English:
won't: oʊ (pronounced the same as the letter "O")
Lips: very rounded and tense.
Tongue: a bit tense, moves from mid to high position.
want: ɑ (pronounced the same as "o" in "hot") or ɔ (pronounced the same as "aw" in "saw")
Lips: Apart, as if you are yawning. Not rounded.
Tongue: Relaxed, flat at the floor of the mouth.
Lips: Apart, very slightly rounded, oval shaper.
Tongue: Slightly tense, down near the floor of the mouth.
while in British English:
British "o" in hot(ɒ), has a very different pronunciation compared to the American "o" in hot(ɑ).