The crossword solution for the term 'kind of onion, rice or omelet' is 'Spanish', which is a seven-letter word. Spanish is a type of onion, rice, and omelet that is popular in many countries. It is a variety of onion that is usually white and has a mild flavor. Spanish rice is a type of rice dish that is cooked with tomatoes, onions, garlic, and other spices. Spanish omelets are made with eggs, potatoes, and onions.