slur over vs slur

slur over is not a noun while slur is a noun.

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

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

slur over (verb)	slur (verb)
treat hurriedly or avoid dealing with properly	become vague or indistinct
	utter indistinctly
	speak disparagingly of; e.g., make a racial slur
	play smoothly or legato