Synonyms of 'plotter'
conspiratorDictionary, architect, intriguerthe chief plotter behind the unsuccessful coup attempt
Copyright © 2016 by HarperCollins Publishers. All rights reserved.
If you refer to someone as a schemer, you mean that they make secret plans in order to get some benefit for themselves.
She is a schemer, my wee sister.
Thesaurus for plotter from the Collins English Thesaurus
A plotter is a person who secretly plans with others to do something that is illegal or wrong , usually against a person or government.