What's the plural form of underextrapolation? Here's the word you're looking for.
Answer
The noun underextrapolation can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be underextrapolation.
However, in more specific contexts, the plural form can also be underextrapolations e.g. in reference to various types of underextrapolations
or a collection of underextrapolations.