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