groom vs hired hand

groom and hired hand both are nouns.

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

As nouns, hired hand is a hypernym of groom; that is, hired hand is a word with a broader meaning than groom:

Other hypernyms of groom include hand, hired man.

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

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