keen vs stabbing

keen is a noun but stabbing is not a noun.

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

As adjectives, keen and stabbing are synonyms defined as:

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

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

keen (adjective)	stabbing (adjective)
excellent	causing physical or especially psychological injury
intense or sharp	painful as if caused by a sharp instrument
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

keen (verb)	stabbing (verb)
express grief verbally