torturer vs scourger

torturer and scourger both are nouns.

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

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

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

Other hyponyms of torturer include flogger.

torturer (noun)	scourger (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)