The sections of a fugue that do not contain the subject are called

The sections of a fugue that do not contain the subject are called "Episodes".
Fugue is a term used in the music or we can say that it is a type or form of music in which one or two themes are repeated and it begins with a simple tune (we can also say this is the section known as exposition) and after that it is repeated or the composer alternates between episodes and the subject presentation.