keen vs knifelike

keen is a noun but knifelike is not a noun.

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

As adjectives, keen and knifelike are synonyms defined as:

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

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

As adjectives, keen and knifelike are synonyms defined as:

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

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

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

keen (verb)	knifelike (verb)
express grief verbally