keen vs groovy

keen is a noun but groovy is not a noun.

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

As adjectives, keen and groovy are synonyms defined as:

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

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

keen (adjective)	groovy (adjective)
excellent	(British informal) very chic
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)	groovy (verb)
express grief verbally