sleek vs sleekness

sleek is not a noun while sleekness is a noun.

Word	Noun	Adjective	Verb	Adverb
sleek	No	Yes	Yes	No
sleekness	Yes	No	No	No

sleek (noun)	sleekness (noun)
	the smooth feel of silk fabric
	the quality of being well-groomed and neatly tailored

sleek (adjective)	sleekness (adjective)
having a smooth, gleaming surface reflecting light; being of a smooth, soft and lustrous quality, resembling silk
well-groomed and neatly tailored; especially too well-groomed
designed or arranged to offer the least resistance to fluid flow

sleek (verb)	sleekness (verb)
make slick or smooth