slenderness vs slender

slenderness is a noun but slender is not a noun.

Word	Noun	Adjective	Verb	Adverb
slenderness	Yes	No	No	No
slender	No	Yes	No	No

slenderness (noun)	slender (noun)
the quality of being slight or inadequate
the property of an attractively thin person
relatively small dimension through an object as opposed to its length or width

slenderness (adjective)	slender (adjective)
	very narrow
	small in quantity
	having little width in proportion to the length or height
	being of delicate or slender build