trouser vs garment

trouser and garment both are nouns.

Word	Noun	Adjective	Verb	Adverb
trouser	Yes	No	No	No
garment	Yes	No	Yes	No

As nouns, garment is a hypernym of trouser; that is, garment is a word with a broader meaning than trouser:

trouser: a garment (or part of a garment) designed for or relating to trousers
garment: an article of clothing

trouser (noun)	garment (noun)
a garment (or part of a garment) designed for or relating to trousers	an article of clothing

trouser (verb)	garment (verb)
	provide with clothes or put clothes on