sindarin_grammar1-3  Exercise 3: Two Kinds of Plural
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Ordinary plural: more than one of a thing, made by changing a vowel
inside the word. adan -> edain, "men".

Class plural: a whole group or kind, made with an ending such as -ath,
-hoth or -rim. elenath, "all the stars".

For "all the stars" you would use the class plural, elenath, because the
meaning is the whole host of stars as a group, not just several of them.