fan vs enthusiast

fan and enthusiast both are nouns.

Word	Noun	Adjective	Verb	Adverb
fan	Yes	No	Yes	No
enthusiast	Yes	No	No	No

As nouns, enthusiast is a hypernym of fan; that is, enthusiast is a word with a broader meaning than fan:

Other hypernyms of fan include partisan, partizan.

fan (noun)	enthusiast (noun)
a device for creating a current of air by movement of a surface or surfaces	an ardent and enthusiastic supporter of some person or activity
an ardent follower and admirer	a person having a strong liking for something
an enthusiastic devotee of sports

fan (verb)	enthusiast (verb)
make (an emotion) fiercer
blow away or off with a current of air
strike out (a batter), (of a pitcher)
agitate the air