noise : racket A+
One analogy for a fan or an enthusiast may be a follower. Another analogy for these terms would be a supporter.
enthusiast, fan, supporter, follower, admirer, buff, fanatic, adherent
fan, supporter, lover, follower, addict, buff, fanatic, devotee
You would call them a sports addict.
The New Enthusiast was created in 2007.
Air Enthusiast was created in 1974.
The homograph for "one devoted to another" is fan, referring to a devoted enthusiast, while the homograph for a "device to stir air" is also fan, referring to the mechanical appliance that circulates air.
A ballet enthusiast is called a "balletomane".
Enthusiast System Architecture was created in 2007.
Wine Enthusiast Magazine was created in 1988.
In real railroad slang, a sub-genre of foamer, any railroad enthusiast or fan who doesn't work in the trade.
A science enthusiast is a person interested in the behavior of the physical universe as a hobby (not as a career).