鞭

champagne

whipping

to whip

whipping

teacher's cane

to teach

whiplash

initiative

flagellum

Giardia lamblia (parasite that causes giardiasis)

flagellate

flagellates

giardiasis

to work hard

birch rod

dinoflagellate

Choanozoa (phylum of protists closer to animals than to fungi)

phytoflagellates

whip

to whip

choanoflagellate

carrot and stick

Choanoflagellatea (class of flagellate eukaryotes closely related to animals)

dinoflagellates

dinoflagellate

encouragement

encouragement