posse vs police

posse and police both are nouns.

Word	Noun	Adjective	Verb	Adverb
posse	Yes	No	No	No
police	Yes	No	Yes	No

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

Other hypernyms of posse include constabulary, law, police force.

posse (noun)	police (noun)
a temporary police force	the force of policemen and officers

posse (verb)	police (verb)
	maintain the security of by carrying out a patrol