Rippling
Part of speech: verb
Definition: To move like the undulating surface of a body of water; to undulate.
Riffle
Part of speech: noun
Definition: A fast-flowing, shallow part of a streamA trough or sluice having cleats, grooves, or steps across the bottom for holding quicksilver and catching particles of gold when auriferous earth is washed. Also one of the cleats, grooves or steps in such trough.A quick skim through the pages of a book
Part of speech: verb
Definition: To ruffle with a rippling actionTo skim or flick through the pages of a bookTo prepare samples of material using a riffler