WikiWords
A WikiWord is a word in a format recognized by the Wiki as signalling a link.
In order to be a WikiWord, the word has to begin with an upper case letter, end with something other than an upper case letter, and have at least one upper case letter in the middle of the word, surrounded by characters that are not upper case.
WikiWord examples: are MatthewBrett, HelpOnLinking, WikiName, One2Three. Note that the last is a WikiWord, where I suppressed the automatic linking behaviour with an initial exclamation mark.
Examples of words that are not a WikiWord: yourName, EndsWithCapitaL, and TwoUPpercase