Stimulant, motivation and incentive are words. Those mean catalyst.
Catalyst
Enzymes
For example the ammonia production; the magnetite catalyst is the most common.
THE NAME OF THE CATALYST WHICH HASTENS THE RATE OF REACTION OF FOOD BUT DOES NOT PART IN THE DIGESTION IS KNOWN AS A CATALYST KNOWN AS MAGANESE(IV)OXIDE.
one name for a catalyst is... to be onis i have no idea myself xxx
Platinum, palladium and rhodium are metals used as catalyst in converters.
biological catalysts
hemoglobin
bait, catalyst, encouragement, consideration.
catalyst
Catalyst
inhibitor