WTF??? I'm certain I typed A m a z o n i a n! 
Same thing happened to me when I used the word on a review I did some months ago. I suspect the problem is that apart from its true connotation it's the name of a well known on line sales site, and so is partly censored because the system thinks you're advertising. Bizarre I know, but whoever set up the system clearly did not have a classical education.
