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