Activist
Part of speech: noun
Definition: one who is politically active in the role of a citizen; especially, one who campaigns for change one who is conspicuously more active in carrying out any occupational or professional functions.
Advocate
Part of speech: verb
Definition: To argue for someone else.To encourage support for something.
Part of speech: noun
Definition: A person who argues the case of another, such as a lawyer in a court.A person who speaks in support of something.A person who supports someone to make their voice heard, or ideally to speak up for themselves.