Stomach

The answer to the crossword question “Stomach is BEAR” is likely “grizzly“. The word “bear” is often used as a metaphor to describe the feeling of hunger or the emptiness of one’s stomach. “Grizzly” is a type of brown bear, and could be used to describe a stomach that is hungry and growling like a grizzly bear. This answer fits the context of the clue and is a common phrase used in everyday language.