spiel vs slur

spiel and slur both are nouns.

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

As verbs, slur is a hyponym of spiel; that is, slur is a word with a more specific, narrower meaning than spiel:

spiel (noun)	slur (noun)
plausible glib talk (especially useful to a salesperson)	a blemish made by dirt
	a disparaging remark
	(music) a curved line spanning notes that are to be played legato

spiel (verb)	slur (verb)
speak at great length (about something)	become vague or indistinct
replay (as a melody)	utter indistinctly
	speak disparagingly of; e.g., make a racial slur
	play smoothly or legato