groom vs honeymooner

groom and honeymooner both are nouns.

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

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

Other hypernyms of groom include adult male, man, newlywed.

groom (noun)	honeymooner (noun)
a man who has recently been married	someone recently married
someone employed in a stable to take care of the horses
a man participant in his own marriage ceremony

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