slur vs spiel

slur and spiel both are nouns.

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

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

Other hypernyms of slur include play.

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

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