clobber vs work over

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

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

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

clobber: strike violently and repeatedly
work over: give a beating to; subject to a beating, either as a punishment or as an act of aggression

Other hypernyms of clobber include beat, beat up.

clobber (noun)	work over (noun)
informal terms for personal possessions

clobber (verb)	work over (verb)
beat thoroughly and conclusively in a competition or fight	give a beating to; subject to a beating, either as a punishment or as an act of aggression
strike violently and repeatedly