A series of five books is called a pentalogy.
The word ‘trilogy’ means ‘a series of three works’. It comes from the Greek trilogia, which is made from two word-forming elements: tri- meaning ‘three’ and logia, which is from logos, meaning ‘story’, ‘idea’, ‘speech’.
In order to find a corresponding word that means ‘a series of five works’, we just replace tri- with the Greek numeral prefix meaning ‘five’, which is penta-. Hence, a pentalogy is a series of five works (or books).
Other words for series’ of works
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|A series of two works||duology|
|A series of three works||trilogy|
|A series of four works||tetralogy|
|A series of five works||pentalogy|
|A series of six works||hexalogy|
|A series of seven works||heptalogy|
|A series of eight works||octology|
|A series of nine works||ennealogy|
|A series of ten works||decalogy|
|A series of eleven works||hendecalogy|
|A series of twelve works||dodecalogy|