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