different between thresher vs thrasher

English

From Middle English thresshere; equivalent to thresh +? -er. The shark's tail is thought to resemble the implement.

thresher (plural threshers)

(agriculture) Anything or anyone that threshes.
(agriculture, obsolete) A now-obsolete hand tool for threshing, also called a flail.
(agriculture) A modern farm machine for threshing grain, now a part of combine harvesters rather than a separate implement.
(zoology) Any of several large pelagic sharks of the genus Alopias, which have a very long tail; more commonly called thresher sharks. [from 1880s]

Originally a variant of thresher; equivalent to thrash +? -er.

thrasher (plural thrashers)

One who thrashes.
Any of several New World passerine songbirds, of the genera Toxostoma, Allenia, Margarops, Oreoscoptes and Ramphocinclus in the family Mimidae, that have a long, downward-curved beak.
A thresher shark.
(informal) A fan of thrash metal music.

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