catalyst (n.)

• agent
• agitator
• agitprop
• author
• begetter
• beginner
• catalysis
• creator
• decay
• demagogue
• dialysis
• dissociation
• effector
• father
• ferment
• firebrand
• fission
• fomenter
• generator
• goad
• hydrolysis
• impetus
• impulse
• incendiary
• incentive
• incitation
• incitement
• inciter
• innovator
• inspirer
• instigator
• leaven
• maker
• mischief-maker
• modifier
• mother
• motivation
• mover
• originator
• parent
• precursor
• producer
• provocateur
• provoker
• rabble-rouser
• ringleader
• rouser
• sire
• splitting
• spur
• stimulant
• transformer
• troublemaker
• urger
• yeast