this question: "...is the naughty word/spam list on this site controlled by the software vendor, or does Greg add the words?"

Greg adds the words. The issue with the word J A Z Z is probably tied to the number of times the SPAMbots have tried to circumvent the filter on really naughty words by purposely mis-spelling the offending word. Also, in some instances (and not necessarily in this instance) the word may appear as part of a larger word that is SPAM. This happens more often with pharmaceutical brand names and C I A L I S is a big offender that blocks the word s p e c i a l i s t.

Jim