Noah Webster's Dictionary (n.) One who forms schemes; a projector; esp., a plotter; an intriguer.

Multi-Version Concordance Schemer (2 Occurrences) Job 5:5 whose harvest the hungry eats up, and take it even out of the thorns. The snare gapes for their substance. (See NAS) Proverbs 24:8 One who plots to do evil will be called a schemer. (WEB NAS NIV)