Can adjectives get plural s?

Question

Are the following sentences correct grammatically? 1- *The war had two hundred **woundeds**.* (And not *wounded soldiers*) 2- *There are two **modals** in that sentence.* (And not *modal verbs*) That is, can we add plural *s* to the adjectives?

Answer 1

Those are not adjectives above. Yes, you can add "s" in the case of "modals". In that case, we're referring to modal verbs as "modals" and so "a modal" becomes a noun, not an adjective. As far as "wounded" you can't add "s". We would say, "two hundred wounded". "Wounded" also in this case becomes a noun (meaning wounded persons/soldiers/etc).