Is Celestials a copyrighted name?

Hello, I'm making a fictional story where there is a special type of beings, They re kind of like gods in the context that they have powers, But you d expect more from them if they really were gods. The problem is that the best (Actually, The only) name that sounds good with them is Celestials , But i recently... show more Hello, I'm making a fictional story where there is a special type of beings, They re kind of like gods in the context that they have powers, But you d expect more from them if they really were gods.
The problem is that the best (Actually, The only) name that sounds good with them is Celestials , But i recently found out that Marvel already has a group/type of characters that are called that.
Is it a copyrighted term, Or am i allowed to call my characters whatever i want?
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