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