Since most people don't want to cart around a complete set, the Oxford Dictionary folks offer a Concise Dictionary. Like clothing fashions that are no longer in vogue, in this edition, words that aren't current are excised to make room for newer ones.
In a funny story about these editions and words, Robert Fulford suggests that we should have a category for "endangered words." He writes, "Perhaps we need a system of adopting words to keep them safe and well, the way people adopt favourite stretches of highway. We would sign up, promise to use our chosen words as often as possible and of course object when they are misused or threatened with abandonment."
My question, what are two words you would try to keep in the concise dictionary?