plotter vs conspirator

plotter and conspirator both are nouns.

Word	Noun	Adjective	Verb	Adverb
plotter	Yes	No	No	No
conspirator	Yes	No	No	No

As nouns, plotter and conspirator are synonyms defined as:

Other synonyms of plotter include coconspirator, machinator.

plotter (noun)	conspirator (noun)
an instrument (usually driven by a computer) for drawing graphs or pictures	a member of a conspiracy
a member of a conspiracy
a planner who draws up a personal scheme of action
a clerk who marks data on a chart