Direct Translations:
* "Guru geiriau": This literally translates to "word guru", but it might sound a bit clunky.
* "Arbenigwr geiriau": This means "word expert" and could be used if you're referring to someone with a deep understanding of language.
More Descriptive Translations:
* "Athro iaith": This means "language teacher" and could be used for someone who guides others in their language learning.
* "Ysgrifennydd medrus": This means "skilled writer" and could be used for someone who is very good at using words.
* "Bardd": This means "poet" and could be used if you're referring to someone who is very skilled in the art of using language creatively.
Contextual Translations:
The best translation would depend on the context in which you are using the term "word guru". For example, if you are referring to someone who is a master of persuasive language, you might use the term "rhethorydd" (rhetorician).
Ultimately, the best way to translate "word guru" into Welsh is to consider the specific context and choose the most appropriate term based on your needs.