Fandom (n): The world of enthusiasts for some amusement or for some artist.
Shipping (n): Slang The activity of discussing, portraying, or advocating a romantic pairing of two characters who appear in a work of (serial) fiction, esp. when such a pairing is not depicted in the original work; (also) a pairing of this type.
Canon (n): Literary Criticism. A body of literary works traditionally regarded as the most important, significant, and worthy of study; those works of esp. Western literature considered to be established as being of the highest quality and most enduring value; the classics (now frequently in the canon). Also (usually with qualifying word): such a body of literature in a particular language, or from a particular culture, period, genre, etc.
Definitions from The Oxford English Dictionary