svelte vs slight

svelte is not a noun while slight is a noun.

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

As adjectives, svelte and slight are synonyms defined as:

Other synonyms of svelte include slender, slim.

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

svelte (adjective)	slight (adjective)
being of delicate or slender build	(quantifier used with mass nouns) small in quantity or degree; not much or almost none or (with `a') at least some
	lacking substance or significance
	being of delicate or slender build

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