My definition (IMHO) is even simpler: there are only two kinds of participants in markets ... specs and hedgers. Hedgers participate because they must; specs do so because they can. Warren Buffet is clearly a speculator.
The only non-speculator in modern equity markets is typically the company itself[*], and only on the day of their IPO (or secondary offerings).
/jordan [*] There are of course exceptions, such as companies whose business plan is speculation itself ...