knifelike vs keen

knifelike is not a noun while keen is a noun.

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

As adjectives, knifelike and keen are synonyms defined as:

knifelike and keen: having or demonstrating ability to recognize or draw fine distinctions

Other synonyms of knifelike include acute, discriminating, incisive, penetrating, penetrative, piercing, sharp.

As adjectives, knifelike and keen are synonyms defined as:

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

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

knifelike (adjective)	keen (adjective)
having a sharp or distinct edge	excellent
having or demonstrating ability to recognize or draw fine distinctions	intense or sharp
cutting or able to cut as if with a knife	having or demonstrating ability to recognize or draw fine distinctions
painful as if caused by a sharp instrument	having a sharp cutting edge or point
	painful as if caused by a sharp instrument

knifelike (verb)	keen (verb)
	express grief verbally