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