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