Compendium
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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 an omnibus is likely to be merely a single volume of a larger series.
Their 6β β³ Γ 10ΒΌβ³ (168 mm Γ 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