cvet

1. flower
   Kupio sam joj jedan cvet za rođendan. — I bought her a flower for her birthday.
   Koji ti je omiljeni cvet? — What's your favourite flower?
2. (on a plant) blossom; bloom
   Trešnja u dvorištu je puna belih cvetova. — The cherry tree in the yard is full of white blossoms.
3. formal (+ gen.) the flower; the cream; prime
   Na skupu se okupio cvet beogradske inteligencije. — The flower of Belgrade's intelligentsia gathered at the event.

For "flowers" in general the collective cveće is usually used; cvetovi mostly means blossoms on a plant.