I’ve come off the SFO-IAD flight and made use of Virgin America’s entertainment system. One of the games was an anagram puzzle where they give you a word and you have to make as many words of 3 letters or more as you can. Even taking into account the American/Proper-English spelling confusion, the dictionary that was being used was not as up-to-date as you’d expect in a game like this.
One word I was given was BMOERSB
According to the game, I couldn’t use the word ORBS. I could use ORB and I could have plurals of any other word I wanted but not ORBS.
Ironically, for an American plane, I could have BOMB, BOMBS and BOMBERS.