Is "Tok" a copyrighted word?

As above.
You know, Tok is part of the popular social netowork "Tik Tok"

But I was wondering if Tok by itself can be a copyrighted word. Can I register a domain that has the word "Tok" in the name? Not TikTok, only Tok.
For example, PornTok.com

Would be problematic?

Do not be confused between a copyright and a trademark.
Copyright does not protect names, titles, slogans, or short phrases, even if they are original or distinctive. In some rare cases, these things may be protected as trademarks.
Common words and phrases can be trademarked if the person or company seeking the trademark can demonstrate that the phrase has acquired a distinctive secondary meaning apart from its original meaning.
https://www.thefreedictionary.com/Tok
So, as an example, someone can write a million long articles about Tok (the nesting place or an assembly of the great grouse) and mention the word "Tok" in them, a billion times and there would be no copyright issues.
So, "Tok" may be trademarked, but not copyrighted.

Аsshole fancy lawyers of some corp can sue you and take your domain if it is nice brand that contains “tok”.