devotee
noun
[ ˌdɛvə(ʊ)ˈtiː ]
• a person who is very interested in and enthusiastic about someone or something.
• "a devotee of Lewis Carroll"
Similar:
enthusiast,
fan,
fanatic,
addict,
lover,
aficionado,
admirer,
buff,
freak,
nut,
fiend,
maniac,
a great one for,
geek,
jock,
fundi,