LYNX.... is the only 4 letter word that came to mind.
i usedt to bet people in hangman using this one
Some common words with an uninterrupted string of five consonants are BACKSPLASH, BACKSTRETCH, BACKSTROKE, BIRTHPLACE, BREASTSTROKE, DOWNSTREAM, DOWNTHRUST, DUMBSTRUCK, EIGHTHS, ERSTWHILE, HEARTTHROB, LENGTHS, LIGHTPROOF, MATCHSTICK, NIGHTCLOTHES, NIGHTCLUB, NIGHTDRESS, POSTSCRIPT, STRENGTHS, THOUSANDTHS, THUMBSCREW, TWELFTHS, WARMTHS, and WITCHCRAFT. ANGSTS is the shortest word with five consonants in a row.
DO your OWN DD... ;P