proponent
A person who advocates or supports a particular theory, proposal, or course of action.
Noun
pl: proponents
This term describes an individual who actively champions a cause or idea, often in a public or formal setting. It carries a connotation of intellectual or political commitment, suggesting a level of strategic support rather than mere passive agreement.
While similar to an advocate, a proponent is frequently associated with the initial proposal or the theoretical framework of a plan. It is commonly used in academic, legal, and political discourse to identify those pushing for specific systemic changes.