To distinguish or tell apart by observing differences; to recognize or identify (transitive).
本物と偽物を見分けるのは難しいことがある。
Sometimes it's difficult to tell the genuine item from a fake.
色の違いで種類を見分けることができる。
You can distinguish the types by the color differences.
彼は声だけで友達の声と他人の声を見分けられる。
He can tell his friend's voice from a stranger's just by the voice.