exquisite vs keen

exquisite is not a noun while keen is a noun.

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

As adjectives, exquisite and keen are synonyms defined as:

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

exquisite (adjective)	keen (adjective)
of extreme beauty	excellent
delicately beautiful	intense or sharp
lavishly elegant and refined	having or demonstrating ability to recognize or draw fine distinctions
intense or sharp	having a sharp cutting edge or point
	painful as if caused by a sharp instrument

exquisite (verb)	keen (verb)
	express grief verbally