obožavalac

1. fan; admirer
   Ispred hotela su pevača čekali obožavaoci. — Fans were waiting for the singer outside the hotel.
   Veliki sam obožavalac njegovih filmova. — I'm a big fan of his films.
2. (romantic) admirer
   Dobila je cveće od tajnog obožavaoca. — She got flowers from a secret admirer.

The feminine is obožavateljka. In declension the movable a is lost and -l- at the end of a syllable changes to -o-: obožavalac → obožavaoca, obožavaocu, plural obožavaoci; the genitive plural keeps -l-: obožavalaca.