I don't believe it's possible to copyright a single word.

You may be able to trademark one, but it's not particularly simple, and you are then legally obligated to defend it against unauthorized use.

"Hobbit" may well be trademarked by the Tolkien estate, as he coined the word.

The others are words commonly used in the English language.

I do believe it's possible to trademark the hallmark appearance of a particular character. Snow White, for instance, exists in a public domain fairytale, so she's free for use, but her characteristic appearance with blue short sleeved top and long yellow skirt, may well be trademarked by Disney, so you'd want to give her a different face and different clothes.

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