flogging vs thrashing

flogging and thrashing both are nouns.

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

As nouns, thrashing is a hypernym of flogging; that is, thrashing is a word with a broader meaning than flogging:

Other hypernyms of flogging include beating, drubbing, lacing, licking, trouncing, whacking.

flogging (noun)	thrashing (noun)
beating with a whip or strap or rope as a form of punishment	the act of inflicting corporal punishment with repeated blows
	a sound defeat