groom vs mousse

groom and mousse both are nouns.

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

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

groom (noun)	mousse (noun)
a man who has recently been married	toiletry consisting of an aerosol foam used in hair styling
someone employed in a stable to take care of the horses	a light creamy dish made from fish or meat and set with gelatin
a man participant in his own marriage ceremony	a rich, frothy, creamy dessert made with whipped egg whites and heavy cream

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