crowd vs army

crowd and army both are nouns.

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

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

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

crowd (noun)	army (noun)
a large number of things or people considered together	a permanent organization of the military land forces of a nation or state
an informal body of friends	a large number of people united for some specific purpose

crowd (verb)	army (verb)
to gather together in large numbers
cause to herd, drive, or crowd together
approach a certain age or speed
fill or occupy to the point of overflowing