The term 'insides' can refer to a variety of things. The crossword solutions for this term include 'FILLING' (7 letters), 'STOMACH' (7 letters), 'CONTENTS' (8 letters), and 'GUTS' (4 letters). FILLING is a term used to describe something that is put inside something else, such as a cake FILLING or a FILLING in a sandwich. The STOMACH is an organ located in the digestive system that helps break down food. CONTENTS refers to the items that are inside something, such as the CONTENTS of a box or the CONTENTS of a book. Finally, GUTS is a slang term used to refer to the internal organs of a person or animal.