dandy vs keen

dandy and keen both are nouns.

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

As adjectives, dandy and keen are synonyms defined as:

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

dandy (noun)	keen (noun)
a sailing vessel with two masts; a small mizzen is aft of the rudderpost	a funeral lament sung with loud wailing
a man who is much concerned with his dress and appearance

dandy (adjective)	keen (adjective)
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

dandy (verb)	keen (verb)
	express grief verbally