slight vs slender

slight is a noun but slender is not a noun.

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

As adjectives, slight and slender are synonyms defined as:

Other synonyms of slight include slim, svelte.

slight (noun)	slender (noun)
a deliberate discourteous act (usually as an expression of anger or disapproval)

slight (adjective)	slender (adjective)
(quantifier used with mass nouns) small in quantity or degree; not much or almost none or (with `a') at least some	very narrow
lacking substance or significance	small in quantity
being of delicate or slender build	having little width in proportion to the length or height
	being of delicate or slender build

slight (verb)	slender (verb)
pay no attention to, disrespect