smashing vs keen

smashing and keen both are nouns.

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

As adjectives, smashing and keen are synonyms defined as:

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

smashing (noun)	keen (noun)
the act of breaking something into small pieces	a funeral lament sung with loud wailing

smashing (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

smashing (verb)	keen (verb)
	express grief verbally