thresher shark vs thrasher

thresher shark and thrasher both are nouns.

Word	Noun	Adjective	Verb	Adverb
thresher shark	Yes	No	No	No
thrasher	Yes	No	No	No

As nouns, thresher shark and thrasher are synonyms defined as:

thresher shark and thrasher: large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed

Other synonyms of thresher shark include Alopius vulpinus, fox shark, thresher.

thresher shark (noun)	thrasher (noun)
large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed	thrush-like American songbird able to mimic other birdsongs
	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