thresh vs work over

thresh and work over both are verbs.

Word	Noun	Adjective	Verb	Adverb
thresh	No	No	Yes	No
work over	No	No	Yes	No

As verbs, work over is a hypernym of thresh; that is, work over is a word with a broader meaning than thresh:

thresh: give a thrashing to; beat hard
work over: give a beating to; subject to a beating, either as a punishment or as an act of aggression

Other hypernyms of thresh include beat, beat up.

thresh (verb)	work over (verb)
give a thrashing to; beat hard	give a beating to; subject to a beating, either as a punishment or as an act of aggression
beat the seeds out of a grain
move or stir about violently
move like a flail; thresh about