thresh about vs thrash

thresh about is not a noun while thrash is a noun.

Word	Noun	Adjective	Verb	Adverb
thresh about	No	No	Yes	No
thrash	Yes	No	Yes	No

As verbs, thresh about and thrash are synonyms defined as:

Other synonyms of thresh about include convulse, jactitate, slash, thrash about, thresh, toss.

thresh about (noun)	thrash (noun)
	a swimming kick used while treading water

thresh about (verb)	thrash (verb)
move or stir about violently	give a thrashing to; beat hard
	beat the seeds out of a grain
	beat thoroughly and conclusively in a competition or fight
	dance the slam dance
	move or stir about violently
	beat so fast that (the heart's) output starts dropping until (it) does not manage to pump out blood at all
	move data into and out of core rather than performing useful computation