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