17-letter words containing il
- white-tailed deer — a common North American deer, Odocoileus virginianus, having a tail with a white underside.
- white-tailed kite — an American kite, Elanus leucurus, having gray plumage with a white head, breast, and tail.
- wild sarsaparilla — a low plant, Aralia nudicaulis, of the ginseng family, native to eastern North America, having a single, long-stalked, compound leaf and a ball-like cluster of greenish-yellow flowers.
- wild service tree — either of two European trees, Sorbus domestica, bearing a small, acid fruit that is edible when overripe, or S. torminalis (wild service tree) bearing a similar fruit.
- wild sweet potato — man-of-the-earth.
- william shoemaker — William Lee ("Willie") 1931–2003, U.S. jockey.
- williams syndrome — an abnormality in the genes involved in calcium metabolism, resulting in learning difficulties
- willow flycatcher — a North American flycatcher, Empidonax alnorum, of alder thickets and other moist areas, that has greenish-brown upper parts and whitish underparts and is almost indistinguishable except by voice from E. traillii (willow flycatcher)
- wind chill factor — A wind chill factor is a measure of the cooling effect of the wind on the temperature of the air.
- wind-chill factor — the apparent temperature felt on the exposed human body owing to the combination of temperature and wind speed.
- worth one's while — a period or interval of time: to wait a long while; He arrived a short while ago.
- yellow water lily — any of several water lilies, as the spatterdock, Nuphar luteum, having yellow flowers.
- zebra swallowtail — a swallowtail butterfly, Papilio marcellus, having black and greenish-white stripes on the wings.