Other forms: conspirators
A conspirator is one of the people secretly plotting something together. Not the lone criminal — the ones who met in a back room and agreed a plan.
The word needs company by definition: nobody is a conspirator alone. History supplies the famous ones and courts supply the rest, since conspiracy is a crime in its own right and each person charged with it is a conspirator. There is a gentler use too — a fellow conspirator can be someone in on a harmless secret, like a surprise party. The adjective conspiratorial describes the manner rather than the crime: a conspiratorial whisper, a conspiratorial glance across the table.
1nounconspiratorOne of a group secretly planning something unlawful or harmful.
“The conspirators met in a rented room above a shop.”
synonyms: plotter, accomplice
From Anglo-Norman - conspiratour.
Etymology from Wiktionary, CC BY-SA