proponent
noun [ C ] uk/prəˈpəʊ.nənt/ us/prəˈpoʊ.nənt/
提倡者，倡导者，辩护者
a person who speaks publicly in support of a particular idea or plan of action
He is one of the leading proponents of capital punishment. 他是死刑的主要支持者之一。
Synonyms: advocate exponentsupporter
Compare: opponent