peachy vs keen

peachy is not a noun while keen is a noun.

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

As adjectives, peachy and keen are synonyms defined as:

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

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

peachy (adjective)	keen (adjective)
of something resembling a peach in color	excellent
excellent	intense or sharp
	having or demonstrating ability to recognize or draw fine distinctions
	having a sharp cutting edge or point
	painful as if caused by a sharp instrument

peachy (verb)	keen (verb)
	express grief verbally