thresher vs thresh

thresher is a noun but thresh is not a noun.

Word	Noun	Adjective	Verb	Adverb
thresher	Yes	No	No	No
thresh	No	No	Yes	No

thresher (noun)	thresh (noun)
large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed
a farm machine for separating seeds or grain from the husks and straw

thresher (verb)	thresh (verb)
	give a thrashing to; beat hard
	beat the seeds out of a grain
	move or stir about violently
	move like a flail; thresh about