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