14-letter words containing a, u, s, p
- walpurgisnacht — (especially in medieval German folklore) the evening preceding the feast day of St. Walpurgis, when witches congregated, especially on the Brocken.
- waste products — the useless products of bodily processes
- water purslane — a creeping, Eurasian annual plant, Lythrum portula, of marshes and wetlands, having small flowers and rounded leaves.
- whiplash-curve — the lash of a whip.
- xiphihumeralis — a long pectoral muscle found only in felines
- yuppie disease — any of a number of debilitating long-lasting viral disorders associated with stress, such as chronic fatigue syndrome, whose symptoms include muscle weakness, chronic tiredness, and depression
- zygosporangium — a sporangium that bears a zygospore.