torturer vs flogger

torturer and flogger both are nouns.

Word	Noun	Adjective	Verb	Adverb
torturer	Yes	No	No	No
flogger	Yes	No	No	No

As nouns, flogger is a hyponym of torturer; that is, flogger is a word with a more specific, narrower meaning than torturer:

torturer: someone who inflicts severe physical pain (usually for punishment or coercion)
flogger: a torturer who flogs or scourges (especially an official whose duty is to whip offenders)

Other hyponyms of torturer include scourger.

torturer (noun)	flogger (noun)
someone who inflicts severe physical pain (usually for punishment or coercion)	a torturer who flogs or scourges (especially an official whose duty is to whip offenders)