keen vs peachy

keen is a noun but peachy is not a noun.

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

As adjectives, keen and peachy are synonyms defined as:

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

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

keen (adjective)	peachy (adjective)
excellent	of something resembling a peach in color
intense or sharp	excellent
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

keen (verb)	peachy (verb)
express grief verbally