IPA: /səˈpɔːrtər/
KK: /səˈpɔrtər/
A person or thing that helps, promotes, or advocates for someone or something, often showing loyalty or support.
She is a strong supporter of environmental protection initiatives.
Supporter → It is formed from "support" (from Old French *supporter*, meaning to carry or bear) and "-er" (meaning a person who). A supporter is a person who carries or bears support for someone or something.
Think of someone who 'carries' support ('support') for another person or cause — that's what a supporter does.