raspoznavati

1. to tell apart; to distinguish
   Moj deda više ne raspoznaje boje dobro. — My grandfather can no longer tell colours apart well.
   Teško je raspoznavati blizance. — It's hard to tell the twins apart.
2. to make out; to discern; to recognize
   U mraku sam jedva raspoznavao obrise kuće. — In the dark I could barely make out the outline of the house.

The perfective is raspoznati; often used with od: raspoznavati jedno od drugog.