Innards are the internal organs of a living organism, and the crossword solutions provided are all terms for different parts of the innards. GUT is a three-letter term for the digestive system, VISCERA is a seven-letter term for the internal organs in general, DUODENA is a seven-letter term for the first part of the small intestine, ENTRAILS is an eight-letter term for the internal organs of an animal used as food, and GUTS is a four-letter term for courage or strength.