drub vs clobber

drub is not a noun while clobber is a noun.

Word	Noun	Adjective	Verb	Adverb
drub	No	No	Yes	No
clobber	Yes	No	Yes	No

As verbs, drub and clobber are synonyms defined as:

drub and clobber: beat thoroughly and conclusively in a competition or fight

Other synonyms of drub include bat, cream, lick, thrash.

drub (noun)	clobber (noun)
	informal terms for personal possessions

drub (verb)	clobber (verb)
beat thoroughly and conclusively in a competition or fight	beat thoroughly and conclusively in a competition or fight
	strike violently and repeatedly