19-letter words containing n, i, e, s, p
- waste disposal unit — an electrically operated fitment in the plughole of a kitchen sink that breaks up food refuse so that it goes down the waste pipe
- waterglass painting — stereochromy.
- welsh mountain pony — a small sturdy but graceful breed of pony used mostly for riding, originally from Wales
- western yellow pine — ponderosa pine.
- whispering campaign — the organized spreading of insinuations or rumors to destroy the reputation of a person, organization, etc.
- whorfian hypothesis — Sapir-Whorf hypothesis.
- winged spindle tree — a stiff, spreading shrub, Euonymus alata, of eastern Asia, having corky-winged twigs, yellowish flowers, and purplish fruit.
- with your eyes open — If you say that you did something with your eyes open or with your eyes wide open, you mean that you knew about the problems and difficulties that you were likely to have.
- xenotransplantation — xenograft.