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