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