flog vs horsewhip

flog is not a noun while horsewhip is a noun.

Word	Noun	Adjective	Verb	Adverb
flog	No	No	Yes	No
horsewhip	Yes	No	Yes	No

As verbs, horsewhip is a hyponym of flog; that is, horsewhip is a word with a more specific, narrower meaning than flog:

Other hyponyms of flog include flagellate, scourge, leather, switch, cowhide, cat, birch.

flog (noun)	horsewhip (noun)
	a whip for controlling horses

flog (verb)	horsewhip (verb)
beat severely with a whip or rod	whip with a whip intended for horses
beat with a cane