agent
agent provocateur
agitator
agitprop
alterant
alterative
alterer
author
begetter
beginner
catalysis
catalytic agent
causer
creator
decay
demagogue
dialysis
dissociation
effector
engenderer
exciter
father
ferment
firebrand
fission
fomenter
generator
goad
hydrolysis
hydrolyst
impetus
impulse
incendiary
incentive
incitation
incitement
inciter
inflamer
innovationist
innovator
inspirer
instigator
introducer
leaven
maker
mischief-maker
modificator
modifier
mother
motivation
causal agency
causal agent
cause
additive
bromide
constituent
contaminant
cyanide
dioxide
fluoride
hydrides
hydrocarbon
hydrogen
hydrogenation
ion
mercury
nitrate
oxide
pesticide
propellant
reagents
solvent
philatelist
inhibitor