IPA: /ɪnˈθuːziəst/
KK: /ɪnˈθuːziæst/
A person who is very passionate and excited about a particular interest or activity.
She is an art enthusiast who visits galleries every weekend.
Enthusiast → It is formed from "enthousiasmos" (from Greek ἐνθουσιασμός, meaning divine inspiration or possession) and the suffix "-ist" (meaning one who practices or is concerned with). The word "enthusiast" refers to a person who is inspired or possessed by a strong passion or interest in something.
Think of someone who is 'inspired' ('enthousiasmos') and is deeply 'concerned' ('-ist') about their passion — that's what an enthusiast is.