crowd vs troop

crowd and troop both are nouns.

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

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

Other hyponyms of crowd include army, crush, jam, press, drove, horde, swarm, huddle, mob, rabble, rout, phalanx, flock.

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

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