flail vs work over

flail is a noun but work over is not a noun.

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

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

flail: 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 flail include beat, beat up.

flail (noun)	work over (noun)
an implement consisting of handle with a free swinging stick at the end; used in manual threshing

flail (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
move like a flail; thresh about