What is the difference between Sushi and Sashimi?

SUSHI:

The common ingredient across all the different kinds of sushi is sushi rice. The variety in sushi arises from the different fillings and toppings, condiments, and the way these ingredients are put together. The same ingredients may be assembled in a traditional or a contemporary way, creating a very different final result.[5] In spelling sushi its first letter s is replaced with z when a prefix is attached, as in nigirizushi, due to consonant mutation called rendaku in Japanese.

Example:

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SASHIMI:

Is a Japanese delicacy primarily consisting of very fresh raw seafood, sliced into thin pieces and served with only a dipping sauce (soy sauce with wasabi paste or other condiments such as grated fresh ginger, or ponzu), depending on the fish, and simple garnishes such as shiso and shredded daikon radish.

Example:

Why not just say it the easy way?

Rice = Sushi
Seafood without rice = Sashimi

There are variations on that but very few and certainly not something the casual consumer will be dealing with.

And by the way - Uni rocks either with, or without, rice!