A WikiWord is any word which contains at least two upper case letters, separated by at least one lower case letter.
This might sound a little clumsy, but the rule is quite easy to apply. It is also called StudlyCaps, CamelCase, BumpyCase? or TitleCase?.
Most wikis (including UseMod) have additional methods for creating links to new pages, such as Free links (wrapping text in double square brackets). E.g.: samplenonwikiword.