neaten vs groom

neaten is not a noun while groom is a noun.

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

As verbs, neaten and groom are synonyms defined as:

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

neaten (verb)	groom (verb)
care for one's external appearance	care for one's external appearance
put (things or places) in order	give a neat appearance to
	educate for a future role or function