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