Check out this list of English words that the editors of the Collins English Dictionary wants to purge to make room for new words and the accompanying article. As it notes, some words that are common in mainstream usage are nonetheless useful in particular communities. As a gamer, I’ve collected my fair share of Periapts of Wisdoms across many different Dungeons & Dragons-based computer games, so I should know!
Then again, while it’s understandable that a dead tree version dictionary wants to drop words because you can only fit in so many in a single volume and still have it at a manageable size, in the Internet age that we live in, these words will never truly be gone. Furthermore by singling out these particular words, the editors have simply given them a short-lived notoriety that will effectively grant them a new lease on life.