Post words that are less commonly used or mess with people's common perception of words Scientific words don't count. Bdellium. It's a word with a silent b. - An aromatic gum resin similar to myrrh, produced by certain Asian and African shrubs or trees of the genus Commiphora. Föhn/foehn - A warm dry wind coming off the lee slopes of a mountain range, especially off the northern slopes of the Alps.