Scrabblist

These [wordplay] curiosities are not in themselves difficult to construct, nor does their solution provide anything much deeper than the solver's thrill, that quite minor delight that the crossword-puzzler or Scrabblist derives from his addiction.

Source: wiktionary

I didn't even have to leave my desk to indulge in my new addiction: online Scrabble. […] I'd begun playing with accomplished Scrabblists, and soon I was ranked thirty-second among my Facebook “friends”—twenty notches lower than those who had never even played.

Source: wiktionary

Unlike Scrabblists, spelling champions […] know the meanings of many of the words and have studied etymology and […] morphology. They read dictionaries, not lists of six-letter words containing j, k, or q, suggesting the knowledge they acquire has greater utility.

Source: wiktionary