good vs keen

good and keen both are nouns.

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

good (noun)	keen (noun)
a raw material that is sold in large quantities, usually to other businesses for manufacturing or production purposes	a funeral lament sung with loud wailing
benefit
moral excellence or admirableness
that which is pleasing or valuable or useful

good (adjective)	keen (adjective)
having desirable or positive qualities especially those suitable for a thing specified	excellent
morally admirable	intense or sharp
promoting or enhancing well-being	having or demonstrating ability to recognize or draw fine distinctions
having the normally expected amount	having a sharp cutting edge or point
with or in a close or intimate relationship	painful as if caused by a sharp instrument
thorough
generally admired
resulting favorably
not left to spoil
not forged
tending to promote physical well-being; beneficial to health
in excellent physical condition
appealing to the mind
agreeable or pleasing
exerting force or influence
most suitable or right for a particular purpose
capable of pleasing
deserving of esteem and respect
of moral excellence
having or showing knowledge and skill and aptitude
financially safe

good (verb)	keen (verb)
	express grief verbally

good (adverb)	keen (adverb)
(often used as a combining form) in a good or proper or satisfactory manner or to a high standard (`good' is a nonstandard dialectal variant for `well')
completely and absolutely (`good' is sometimes used informally for `thoroughly')