S: (n) plot, secret plan, game (a secret scheme to do something (especially something underhand or illegal)) "they concocted a plot to discredit the governor"; "I saw through his little game from the start"
S: (v) conspire, cabal, complot, conjure, machinate (engage in plotting or enter into a conspiracy, swear together) "They conspired to overthrow the government"
W: (adj) conspirative [Related to: conspire] (relating to or characteristic of conspiracy or conspirators) "a conspiratorial whisper"; "the discovery of possible conspirative codes"