neat vs keen

neat is not a noun while keen is a noun.

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

As adjectives, neat and keen are synonyms defined as:

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

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

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

neat (verb)	keen (verb)
	express grief verbally