riff vs riffle

riff and riffle both are nouns.

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

As verbs, riff and riffle are synonyms defined as:

Other synonyms of riff include flick, flip, leaf, thumb.

riff (noun)	riffle (noun)
a jazz ostinato; usually provides a background for a solo improvisation	shuffling by splitting the pack and interweaving the two halves at their corners
	a small wave on the surface of a liquid

riff (verb)	riffle (verb)
play riffs	shuffle (playing cards) by separating the deck into two parts and riffling with the thumbs so the cards intermix
look through a book or other written material	twitch or flutter
	stir up (water) so as to form ripples
	look through a book or other written material