shock troops vs troop

shock troops and troop both are nouns.

Word	Noun	Adjective	Verb	Adverb
shock troops	Yes	No	No	No
troop	Yes	No	Yes	No

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

shock troops: soldiers who are specially trained and armed to lead an assault
troop: a group of soldiers

shock troops (noun)	troop (noun)
soldiers who are specially trained and armed to lead an assault	a group of soldiers
	an orderly crowd
	a unit of Girl or Boy Scouts
	a cavalry unit corresponding to an infantry company

shock troops (verb)	troop (verb)
	move or march as if in a crowd
	march in a procession in a public place