15-letter words containing t, h, i, s, w, o
- untrustworthily — in an untrustworthy manner; not trustworthily
- washington lily — a lily, Lilium washingtonianum, of the western coast of the U.S., having whorled leaves and fragrant, purple-spotted white flowers.
- washington palm — a palm tree, Washingtonia filifera, of California and Florida, having large fan-shaped leaves and small black fruits
- weather station — an installation equipped and used for meteorological observation.
- whaling station — a place where the carcases of whales were processed
- what's cooking? — what's happening?
- whip into shape — to bring by vigorous action into the proper or desired condition
- whistle-blowing — a person who informs on another or makes public disclosure of corruption or wrongdoing.
- white cast iron — cast iron having most or all of its carbon in the form of cementite and exhibiting a silvery fracture.
- white corpuscle — white blood cell.
- white mountains — a mountain range in the US, chiefly in N New Hampshire: part of the Appalachians. Highest peak: Mount Washington, 1917 m (6288 ft)
- white snakeroot — a North American plant, Eupatorium urticaefolium, the roots or rhizomes of which have been used as a remedy for snakebite
- wilson's thrush — veery.
- winter holidays — a period of rest from work or studies taken in winter
- witch of agnesi — a plane curve symmetrical about the y- axis and asymptotic to the x- axis, given by the equation x 2 y =4 a 2 (2 a − y).
- with respect to — as regards
- without reserve — without reservations; fully; wholeheartedly
- worcester china — porcelain articles made in Worcester (England) from 1751 in a factory that became, in 1862, the Royal Worcester Porcelain Company
- yellow goatfish — a schooling goatfish, Mulloidichthys martinicus, inhabiting the Atlantic Ocean from Florida to Panama.