French /ɑ̃/ vs /ɔ̃/
dans vs bon: open nasal vs rounded nasal

Both French AN and ON are nasal vowels, but they sit at different points in the mouth. /ɑ̃/ is open and unrounded — the tongue stays low and back, mouth wide. /ɔ̃/ is rounded — the lips purse like for "o" and the tongue rises slightly. That rounding is the whole difference.

The ABX drill plays two reference sounds then a mystery X. Five rounds will train your ear to hear the lip rounding difference between these two nasals.

👃Both nasal vowels
⬇️/ɑ̃/ unrounded, low
💋/ɔ̃/ rounded, higher
🚫Neither exists in English
Can you hear the difference?
How it works: You'll hear sound A, sound B, then a mystery sound X. Choose whether X sounds like A or B. Words are revealed after you answer.
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Listen carefully...

Mystery sound

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The problem

Why /ɑ̃/ and /ɔ̃/ blur together

English speakers hear both as "some nasal vowel" because English has no nasal vowels at all. The first challenge is learning to hear nasality as a vowel quality — not just a consonant artifact. The second challenge is discriminating within the nasal category.

/ɑ̃/ and /ɔ̃/ differ primarily in lip rounding. /ɑ̃/ is unrounded (like "ah" through the nose). /ɔ̃/ is rounded (like "oh" through the nose). Because English does not use lip rounding contrastively for nasal sounds, this distinction goes unnoticed until specifically trained.

There is also a spelling trap: English speakers see "on" and expect the vowel to sound like English "on" — which is an oral vowel. French "on" is a nasal vowel with rounded lips, pronounced in a single breath, with no closing consonant.

Common mix-ups
  • ✗ sans (without) confused with son (his/sound)
  • ✗ dans (in) confused with don (gift)
  • ✗ rang (rank) confused with rond (round)
  • ✗ Pronouncing both as "ahn" because English has no nasal "on"
The lip-rounding test

Watch your lips in a mirror. Say /ɑ̃/ (AN) — your lips should be neutral, mouth open, no rounding. Now say /ɔ̃/ (ON) — your lips should purse forward in an "o" shape. That visible rounding is the difference. Same nasal quality, completely different lip position.

Production guide

How to produce /ɑ̃/ and /ɔ̃/

/ɑ̃/French AN — dans, grand, sans
  1. 1. Open your mouth wide — like a deep "ah."
  2. 2. Lips stay neutral — no rounding, no spreading.
  3. 3. Tongue low, at the back of the mouth.
  4. 4. Lower the velum: air through the nose. Hold steady.
Anchor words: dans, grand, sans, banc, rang, blanc, temps
/ɔ̃/French ON — bon, long, pont
  1. 1. Say "oh" — round your lips and push them slightly forward.
  2. 2. Tongue is mid-back, slightly higher than for /ɑ̃/.
  3. 3. Lower the velum: air through the nose while holding "oh."
  4. 4. No final "n" — the vowel itself carries all the nasal quality.
Anchor words: bon, long, nom, pont, rond, son, ton, fond
The mirror exercise

Say "ah" then "oh" in a mirror — you can see your lips go from neutral-open to rounded. Now add nasality to each: "ahn" (with no final n) = /ɑ̃/; "ohn" (with no final n) = /ɔ̃/. The lip shape you see for each is the diagnostic. If your lips look the same for both, you are merging the sounds.

Click to hear

Minimal pairs: tap each word to hear it

Real words that show the AN (/ɑ̃/) vs ON (/ɔ̃/) contrast. Click each to compare.

French AN /ɑ̃/
French ON /ɔ̃/
without
↔
good
in / inside
↔
name
big / great
↔
round
rank / row
↔
long
bench
↔
bridge
More /ɑ̃/ words
dansgrandsansblancbancrangtempscentventdentsangcampjambeenfantlent
More /ɔ̃/ words
bonlongnompontrondsontonfondmondonnononbombeombreconte
Common questions

Frequently asked

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French Minimal PairsAll French sound contrast guides

an vs on is one of many French nasal contrasts

MinimalPairs trains your ear on all French nasal vowels and vowel contrasts with ABX drills and personalized targeting.

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