Funnily enough, these were the two words I dithered about whether to include! In the end I kept to the rule of leaving out anything that's not in both of two dictionaries (dictionary.com and oxforddictionaries.com), or is a proper noun. Sorry.
What about 'masse'? It's a different word from 'mass', derived from French; you hear people say 'en masse' sometimes. I was surprised it wasn't in here.