Compendium
𐑒𐑩𐑥𐑐𐑧𐑯𐑛𐑾𐑥
In the context of comics, a compendium collects the complete works of a franchise for a given time span, author, or series. They're usually over 500 pages long, and often over twice that. Even then, comics are so prolific that a compendium is likely to be merely a single volume of a larger series.
Their 6⅝″ × 10¼″ (168 mm × 260 mm) paperback format is the same as a regular trade paperback, only thicker. Compare with an omnibus, which collects the same mammoth set of issues in a more expensive large hardcover book.
Comic formats: Comic book | Compendium | Graphic novel | Omnibus | Trade paperback