horsewhipping vs flagellation

horsewhipping and flagellation both are nouns.

Word	Noun	Adjective	Verb	Adverb
horsewhipping	Yes	No	No	No
flagellation	Yes	No	No	No

As nouns, flagellation is a hypernym of horsewhipping; that is, flagellation is a word with a broader meaning than horsewhipping:

Other hypernyms of horsewhipping include flogging, lashing, tanning, whipping.

horsewhipping (noun)	flagellation (noun)
the act of whipping with a horsewhip	beating with a whip or strap or rope as a form of punishment
	beating as a source of erotic or religious stimulation