leotards vs maillot

leotards and maillot both are nouns.

Word	Noun	Adjective	Verb	Adverb
leotards	Yes	No	No	No
maillot	Yes	No	No	No

As nouns, maillot is a hyponym of leotards; that is, maillot is a word with a more specific, narrower meaning than leotards:

leotards: skintight knit hose covering the body from the waist to the feet worn by acrobats and dancers and as stockings by women and girls
maillot: tights for dancers or gymnasts

Other hyponyms of leotards include pantyhose.

leotards (noun)	maillot (noun)
skintight knit hose covering the body from the waist to the feet worn by acrobats and dancers and as stockings by women and girls	tights for dancers or gymnasts
	a woman's one-piece bathing suit