Nigiri vs. Onigiri

Nigirinoun

Regular sushi: a piece of raw fish (or other topping) on top of a small oblong brick of sticky white rice.

Onigirinoun

A rice ball.

Onigiri

Onigiri (お握り or 御握り), also known as omusubi (お結び), nigirimeshi (握り飯), or rice ball, is a Japanese food made from white rice formed into triangular or cylindrical shapes and often wrapped in nori. Traditionally, an onigiri is filled with pickled ume (umeboshi), salted salmon, katsuobushi, kombu, tarako, mentaiko, takanazuke (pickled takana) or any other salty or sour ingredient as a natural preservative.