Save a word! Every year hundreds of words are excised from dictionaries for lack of use. Go adopt a word, add it to your vocabulary, and save it from extinction.
By popular demand, our families word is ichthyarchy (n.) The domain of fishes. - Don't tell the captain you fell overboard, tell him you wanted to explore the ichthyarchy!
Since we have four separate ichthyarchies in our house, it seemed like a natural one to all of us. We'll see what the boys' teachers think of it tomorrow.