If you are looking for economical resources which might help him stretch in his areas of interest, there are many to be found online. One which comes to mind right away based on his interest in word games/puzzles, spelling and remembering long words is
Spelling City, which offers both "free" games and activities and those which are accessible with a paid membership.
WordCount is a visual depiction of the frequency of word usage. The word "gifted" is listed as the 11,320th most commonly used word... found sandwiched between "renew" and "abrupt".
The Davidson Database has an extensive list of resources including a webpage dedicated to
Games and Puzzles for gifted students.
Homeschool sites, such as Gifted Homeschoolers Forum (GHF) also post
lists of resources.
Hoagies does too.
There's also the
Mensa for Kids website.
