slur vs verbalize

slur is a noun but verbalize is not a noun.

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

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

Other hypernyms of slur include mouth, speak, talk, utter, verbalise.

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

slur (verb)	verbalize (verb)
become vague or indistinct	convert into a verb
utter indistinctly	express in speech
speak disparagingly of; e.g., make a racial slur	be verbose
play smoothly or legato	articulate; either verbally or with a cry, shout, or noise