groom vs barber

groom and barber both are nouns.

Word	Noun	Adjective	Verb	Adverb
groom	Yes	No	Yes	No
barber	Yes	No	Yes	No

As verbs, barber is a hyponym of groom; that is, barber is a word with a more specific, narrower meaning than groom:

groom (noun)	barber (noun)
a man who has recently been married	a hairdresser who cuts hair and shaves beards as a trade
someone employed in a stable to take care of the horses
a man participant in his own marriage ceremony

groom (verb)	barber (verb)
care for one's external appearance	perform the services of a barber: cut the hair and/or beard of
give a neat appearance to
educate for a future role or function