“Don’t ever forget that your position at this firm is fungible.” This word is great for its association with fungus, to which, by the way, it has no relation. It derives from the Latin verb fungi, which means to perform. The present meaning is to make something replaceable, in other words, something that will perform just as well. Thus you could say that your friend’s twenty dollar bill is fungible. She’ll think that something is growing on the bill, but you really mean that you could substitute another bill to work just as well. (Source: Merriam-Webster’s 365 New Words Calendar)