keen vs neat

keen is a noun but neat is not a noun.

Word	Noun	Adjective	Verb	Adverb
keen	Yes	Yes	Yes	No
neat	No	Yes	No	No

As adjectives, keen and neat are synonyms defined as:

Other synonyms of keen include bang-up, bully, corking, cracking, dandy, great, groovy, nifty, not bad, old, peachy, slap-up, smashing, swell.

keen (noun)	neat (noun)
a funeral lament sung with loud wailing

keen (adjective)	neat (adjective)
excellent	free from clumsiness; precisely or deftly executed
intense or sharp	excellent
having or demonstrating ability to recognize or draw fine distinctions	superficially impressive, but lacking depth and attention to the true complexities of a subject
having a sharp cutting edge or point	clean or organized
painful as if caused by a sharp instrument	(of an alcoholic drink) without water
	showing care in execution

keen (verb)	neat (verb)
express grief verbally