thrashing vs whacking

thrashing and whacking both are nouns.

Word	Noun	Adjective	Verb	Adverb
thrashing	Yes	No	No	No
whacking	Yes	Yes	No	Yes

As nouns, thrashing and whacking are synonyms defined as:

thrashing and whacking: the act of inflicting corporal punishment with repeated blows

Other synonyms of thrashing include beating, drubbing, lacing, licking, trouncing.

thrashing (noun)	whacking (noun)
the act of inflicting corporal punishment with repeated blows	the act of inflicting corporal punishment with repeated blows
a sound defeat

thrashing (adjective)	whacking (adjective)
	(British informal) enormous

thrashing (adverb)	whacking (adverb)
	to an abnormal extent