Discussion of ealar is in the latter three HoMe volumes, but which texts specifically I cannot recall at the moment. Tomorrow I may be able to provide more specific information.
Saucepan Man is right, though. There is no evidence of other classes of ealar besides Ainur, but there is also no reason to believe Ainur were the only kind of ealar. Why call them Ainur if they're the only kind of ealar anyway? Wouldn't one term or the other suffice?
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