WordNet: enthusiast, partisan, partizan

an ardent and enthusiastic supporter of some person or activity

• hypernym admirer, booster, champion, friend, protagonist, supporter

• hyponym addict, freak, junkie, junky, nut

• hyponym backslapper

• hyponym balletomane

• hyponym fanatic, fiend

• hyponym gadgeteer

• hyponym shutterbug

• hyponym fan, rooter, sports fan

enthusiast

• (suomi) entusiasti (synonyymi)

partisan

• (englanti) partisan (derivationally related)

• (englanti) partisanship (derivationally related)
• (suomi) intoilija (synonyymi)

partizan

• (englanti) partizan (derivationally related)
• (suomi) kannattaja (synonyymi)