extortioner vs blackmailer

extortioner and blackmailer both are nouns.

Word	Noun	Adjective	Verb	Adverb
extortioner	Yes	No	No	No
blackmailer	Yes	No	No	No

As nouns, extortioner and blackmailer are synonyms defined as:

extortioner and blackmailer: a criminal who extorts money from someone by threatening to expose embarrassing information about them

Other synonyms of extortioner include extortionist.

extortioner (noun)	blackmailer (noun)
a criminal who extorts money from someone by threatening to expose embarrassing information about them	a criminal who extorts money from someone by threatening to expose embarrassing information about them