Yes, canon is a Scrabble word!

Noun

1. A rule or especially body of rules or principles generally established as valid and fundamental in a field or art or philosophy

2. A priest who is a member of a cathedral chapter

3. A ravine formed by a river in an area with little rainfall

4. A contrapuntal piece of music in which a melody in one part is imitated exactly in other parts

5. A complete list of saints that have been recognized by the Roman Catholic Church

6. A collection of books accepted as holy scripture especially the books of the Bible recognized by any Christian church as genuine and inspired