clobber vs drub

clobber is a noun but drub is not a noun.

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

As verbs, clobber and drub are synonyms defined as:

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

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

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

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