lancinate vs keen

lancinate is not a noun while keen is a noun.

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

As adjectives, lancinate and keen are synonyms defined as:

Other synonyms of lancinate include cutting, knifelike, lancinating, piercing, stabbing.

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

lancinate (adjective)	keen (adjective)
painful as if caused by a sharp instrument	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

lancinate (verb)	keen (verb)
	express grief verbally