pantsuit vs pants suit

pantsuit and pants suit both are nouns.

Word	Noun	Adjective	Verb	Adverb
pantsuit	Yes	No	No	No
pants suit	Yes	No	No	No

As nouns, pantsuit and pants suit are synonyms defined as:

pantsuit and pants suit: a pair of pants and a matching jacket worn by women

pantsuit (noun)	pants suit (noun)
a pair of pants and a matching jacket worn by women	a pair of pants and a matching jacket worn by women