enthusiast:
(plural: ‘enthusiasts‘)
a person who is habitually full of enthusiasm;
a fanatic; a fan;
a supporter of a person who is filled with deep love or interest in some activity or in some person;
(in religion & less commonly) a devotee,

a computer enthusiast, thinking about computers all the time
Paddy is a football enthusiast; he is there at every match played in our stadium without fail … rain or shine.
I cannot call myself a music enthusiast because, though I listen to some music on and off, I don’t really spend considerable time on it or go to concerts or something like that!
When some pressing social issue, such as corruption, child labour, domestic violence or gay marriages, is broadcast on TV, we see many enthusiasts coming forward to give out their comments and some overenthusiastic clubs even organise meetings to debate on those issues, but after a couple of days, the enthusiasm dies down and people get back to their normal lives, some even committing the same atrocities or just tolerating those issues they’ve vehemently condemned in their debates!

a family of cycling enthusiasts

