15-letter words containing a, p, l, s, i
- undisciplinable — unable to be disciplined or controlled
- unphilosophical — not adhering to philosophical theory or principles
- unsportsmanlike — a man who engages in sports, especially in some open-air sport, as hunting, fishing, racing, etc.
- upper peninsula — a peninsula in the northern US between Lakes Superior and Michigan, constituting the N part of the state of Michigan
- vicar apostolic — Roman Catholic Church. a titular bishop serving either in a district where no episcopal see has been established, or in one where the succession of bishops has been interrupted.
- wallpaper music — music that is pleasant but not interesting, so people do not pay much attention to it
- walpurgis night — (especially in medieval German folklore) the evening preceding the feast day of St. Walpurgis, when witches congregated, especially on the Brocken.
- washing-up bowl — plastic bowl used for washing dishes
- washington palm — a palm tree, Washingtonia filifera, of California and Florida, having large fan-shaped leaves and small black fruits
- westphalian ham — a hard German ham with a distinctive flavor derived from being smoked over beechwood and juniper.
- whiplash injury — the lash of a whip.
- winter purslane — a plant, Montia perfoliata, native to western North America, of the purslane family, having edible, egg-shaped leaves and clusters of small, white flowers.
- withdrawal slip — a small paper form which has to be filled in before making a withdrawal of money from a bank, building society, etc
- yorke peninsula — a peninsula in S Australia between Spencer Gulf and the Gulf of St. Vincent. 160 miles (257 km) long and 20–35 miles (32–56 km) wide.