dragoon vs trooper

dragoon and trooper both are nouns.

Word	Noun	Adjective	Verb	Adverb
dragoon	Yes	No	Yes	No
trooper	Yes	No	No	No

As nouns, trooper is a hypernym of dragoon; that is, trooper is a word with a broader meaning than dragoon:

dragoon: a member of a European military unit formerly composed of heavily armed cavalrymen
trooper: a soldier mounted on horseback

Other hypernyms of dragoon include cavalryman.

dragoon (noun)	trooper (noun)
a member of a European military unit formerly composed of heavily armed cavalrymen	a mounted police officer
	a soldier in a motorized army unit
	a state police officer
	a soldier mounted on horseback

dragoon (verb)	trooper (verb)
compel by coercion, threats, or crude means
subjugate by imposing troops