поддръжник означава в английски

advocate [advocates]▼(person who speaks in support of something)
noun
[UK: ˈæd.vək.eɪt] [US: ˈæd.vəkət]

backer [backers]▼(one who backs)
noun
[UK: ˈbækə(r)] [US: ˈbækər]

contributor [contributors]▼(a person who backs, supports or champions a cause, activity or institution)
noun
[UK: kən.ˈtrɪ.bjuː.tə(r)] [US: kən.ˈtrɪ.bjə.tər]

supporter [supporters]▼(person who supports, an adherent)
noun
[UK: sə.ˈpɔː.tə(r)] [US: sə.ˈpɔːr.tər]