riff vs spiel

riff and spiel both are nouns.

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

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

Other hypernyms of riff include play.

riff (noun)	spiel (noun)
a jazz ostinato; usually provides a background for a solo improvisation	plausible glib talk (especially useful to a salesperson)

riff (verb)	spiel (verb)
play riffs	speak at great length (about something)
look through a book or other written material	replay (as a melody)