18-letter words containing h, p, i
- warehouse capacity — the amount of storage space in a warehouse
- welland ship canal — a ship canal in S Canada, in Ontario, connecting Lakes Erie and Ontario: 8 locks. 25 miles (40 km) long.
- wernicke's aphasia — a type of aphasia caused by a lesion in Wernicke's area of the brain and characterized by grammatical but more or less meaningless speech and an apparent inability to comprehend speech.
- western hemisphere — the western part of the terrestrial globe, including North and South America, their islands, and the surrounding waters.
- whispering gallery — a space or gallery beneath a dome or broad arch in which low sounds produced at any of certain points are clearly audible at certain other distant points.
- white iron pyrites — marcasite
- white trumpet lily — a lily, Lilium longiflorum, of Japan, having fragrant, pure white, trumpet-shaped flowers nearly 7 inches (18 cm) in length.
- white-spotted hyla — a type of tree frog (H. leucophyllata) of tropical America
- wilson's phalarope — a phalarope, Phalaropus tricolor, that breeds in the prairie regions of North America and winters in Argentina and Chile.
- wireless telephone — Now Rare. radiotelephony.
- wireless telephony — Now Rare. radiotelephony.
- withdrawal symptom — effects of stopping a drug
- working hypothesis — See under hypothesis (def 1).
- world championship — an international competition in a particular sport or activity for people all around the world