Word nerd alert: Merriam-Webster announced Thursday it has taken the rare step of fully revising and reimagining one of its most popular dictionaries with a fresh edition that adds over 5,000 new words, including "petrichor," "teraflop," "dumbphone" and "ghost kitchen." The 12th edition of "Merriam-Webster's Collegiate Dictionary" comes 22 years after the book's last hard-copy update and amid declining U.S. sales for analog dictionaries overall, according to Circana BookScan.