persuader vs Svengali

persuader and Svengali both are nouns.

Word	Noun	Adjective	Verb	Adverb
persuader	Yes	No	No	No
Svengali	Yes	No	No	No

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

persuader: someone who tries to persuade or induce or lead on
Svengali: someone (usually maleficent) who tries to persuade or force another person to do his bidding

Other hyponyms of persuader include lobbyist, coaxer, wheedler.

persuader (noun)	Svengali (noun)
someone who tries to persuade or induce or lead on	the musician in a novel by George du Maurier who controls Trilby's singing hypnotically
	someone (usually maleficent) who tries to persuade or force another person to do his bidding