hired hand vs groom

hired hand and groom both are nouns.

Word	Noun	Adjective	Verb	Adverb
hired hand	Yes	No	No	No
groom	Yes	No	Yes	No

As nouns, groom is a hyponym of hired hand; that is, groom is a word with a more specific, narrower meaning than hired hand:

hired hand (noun)	groom (noun)
a hired laborer on a farm or ranch	a man who has recently been married
	someone employed in a stable to take care of the horses
	a man participant in his own marriage ceremony

hired hand (verb)	groom (verb)
	care for one's external appearance
	give a neat appearance to
	educate for a future role or function