groom vs participant

groom and participant both are nouns.

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

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

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

groom (noun)	participant (noun)
a man who has recently been married	someone who takes part in an activity
someone employed in a stable to take care of the horses	a person who participates in or is skilled at some game
a man participant in his own marriage ceremony

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