platoon vs police squad

platoon and police squad both are nouns.

Word	Noun	Adjective	Verb	Adverb
platoon	Yes	No	No	No
police squad	Yes	No	No	No

As nouns, police squad is a hypernym of platoon; that is, police squad is a word with a broader meaning than platoon:

platoon: a team of policemen working under the military platoon system
police squad: a small squad of policemen trained to deal with a particular kind of crime

Other hypernyms of platoon include squad.

platoon (noun)	police squad (noun)
a military unit that is a subdivision of a company; usually has a headquarters and two or more squads; usually commanded by a lieutenant	a small squad of policemen trained to deal with a particular kind of crime
a team of policemen working under the military platoon system
a group of persons who are engaged in a common activity