The whole point of not awarding bonuses (boni?) to prefixes and suffixes is to encourage more interesting words; otherwise people will have a tendency to just tack on suffixes to boring words, especially if "s" or "ed" gives a high point value. So I think that if it exists as a suffix, it shouldn't be awarded extra points. But that's just my take on it.


Some people say camping is boring. I say it's in tents.