Answer: CATALYST

Possible questions:


Spark we know 11 Answers
Instigator we know 3 Answers
Agent of change we know 2 Answers
Stimulus of a kind we know 1 Answer
Prompter we know 2 Answers
It makes things happen we know 1 Answer
That which causes we know 1 Answer
Spark plug of a sort we know 1 Answer
Precipitating agent we know 1 Answer
Part of a chemical reaction we know 1 Answer
Chemist's reaction-producer we know 1 Answer
Change agent we know 1 Answer
Agent for action we know 1 Answer
Action accelerator we know 1 Answer

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