vokal

1. (in linguistics) vowel
   Srpski jezik ima pet vokala. — Serbian has five vowels.
   U toj reči je vokal dug. — The vowel in that word is long.
2. (in music) vocalist; vocals
   On je vokal jednog beogradskog benda. — He's the singer in a Belgrade band.
   Vokal se u ovoj pesmi jedva čuje. — The vocals are barely audible in this song.

For "vowel", schools more often use «samoglasnik».