sotona

1. Satan; the devil
   U filmu se glavni junak bori protiv sotone. — In the film, the main character fights Satan.
2. colloq. (of a person) devil; little devil
   Taj mali je pravi sotona, sve je polomio. — That kid is a real little devil, he broke everything.

The word can take either masculine or feminine agreement, depending on its meaning and the context.