troop vs crowd

troop and crowd both are nouns.

Word	Noun	Adjective	Verb	Adverb
troop	Yes	No	Yes	No
crowd	Yes	No	Yes	No

As nouns, crowd is a hypernym of troop; that is, crowd is a word with a broader meaning than troop:

troop (noun)	crowd (noun)
a group of soldiers	a large number of things or people considered together
an orderly crowd	an informal body of friends
a unit of Girl or Boy Scouts
a cavalry unit corresponding to an infantry company

troop (verb)	crowd (verb)
move or march as if in a crowd	to gather together in large numbers
march in a procession in a public place	cause to herd, drive, or crowd together
	approach a certain age or speed
	fill or occupy to the point of overflowing