What's the plural form of preterpluperfect? Here's the word you're looking for.
Answer
The noun preterpluperfect can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be preterpluperfect.
However, in more specific contexts, the plural form can also be preterpluperfects e.g. in reference to various types of preterpluperfects
or a collection of preterpluperfects.
Examples
Brussels is the preterpluperfect tense of fashion, and Turkey is taste in its dying agonies.