intense vs keen

intense is not a noun while keen is a noun.

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

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

intense (adjective)	keen (adjective)
possessing or displaying a distinctive feature to a heightened degree	excellent
(of color) having the highest saturation	intense or sharp
extremely sharp or severe	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

intense (verb)	keen (verb)
	express grief verbally