приверженец meaning in English

adherent [adherents]▼(a person who has membership in some group)
noun
[UK: əd.ˈhɪə.rənt] [US: əd.ˈhɪ.rənt]

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

booster [boosters]▼(Someone who is a fan or supporter of something)
noun
[UK: ˈbuː.stə(r)] [US: ˈbuː.stər]

partisan [partisans]▼(adherent to a party)
noun
[UK: ˌpɑː.tɪ.ˈzæn] [US: ˈpɑːr.tə.zən]

stickler [sticklers]▼(someone who insistently advocates for something)
noun
[UK: ˈstɪ.klə(r)] [US: ˈstɪk.ə.lər]

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