Octalogy is a term that refers to a series of eight books, films, or other works related to a common theme or story. However, there are many synonyms that can be used to describe an eight-part series. One such synonym is "octet," which is a group of eight musicians or musical compositions. Another synonym is "octet cycle," which refers to a series of eight related compositions or literary works. "Octave" is another word that can be used to describe a set of eight, particularly a range of musical notes spanning eight tones. Other synonyms for octalogy include "octad" and "octagon".