Catalyst
Part of speech: noun
Definition: A substance which increases the rate of a chemical reaction without being consumed in the process. A catalytic converter. Someone or something that helps or encourages progress or change.
Example sentence: As a product of education, I have always believed in the power of education as the most powerful, high-impact catalyst for transformation. Look at the impact that the Indian Institutes of Technology have had globally.
Accelerator
Part of speech: noun
Definition: One who, or that which, accelerates.A device for causing acceleration.A substance which speeds up chemical reactions.accelerator pedal.
Example sentence: The brutal reality about aging is that it has only an accelerator pedal. We have yet to discover whether a brake exists for people.