noun

le menton

chin

C'est la partie du visage qui se trouve sous la bouche.

The French word "menton" means "chin" in English.

Explanation:

"Menton" refers to the part of the face below the mouth and above the neck. It's the protruding part at the bottom of your face.
It is a neutral, standard anatomical term and is used in both everyday language and formal contexts.

Synonyms and differences:

"Menton" is the primary and widely used word for "chin."
There are no strict synonyms for "menton," but sometimes facial features like "pommettes" (cheekbones) or "maxillaire" (jaw) are referenced, though they refer to different parts of the face.
Informally, people might say "machoire basse" for "lower jaw," but "menton" specifically refers to the chin area.

In short, "menton" = chin, the bottom central part of the face, a standard and neutral term.