slur vs weaken

slur is a noun but weaken is not a noun.

Word	Noun	Adjective	Verb	Adverb
slur	Yes	No	Yes	No
weaken	No	No	Yes	No

As verbs, weaken is a hypernym of slur; that is, weaken is a word with a broader meaning than slur:

slur (noun)	weaken (noun)
a blemish made by dirt
a disparaging remark
(music) a curved line spanning notes that are to be played legato

slur (verb)	weaken (verb)
become vague or indistinct	become weaker
utter indistinctly	lessen the strength of
speak disparagingly of; e.g., make a racial slur	reduce the level or intensity or size or scope of
play smoothly or legato	lessen in force or effect
	destroy property or hinder normal operations