18-letter words containing a, s, c, h, f
- school certificate — (in England and Wales between 1917 and 1951 and currently in New Zealand) a certificate awarded to school pupils who pass a public examination: the equivalent of GCSE
- school for scandal — a comedy of manners (1777) by Richard Brinsley Sheridan.
- scottish blackface — a common breed of hardy mountain sheep having horns and a black face, kept chiefly on the mainland of Scotland
- sign of the zodiac — one of the twelve constellations along the path of the ecliptic.
- soft touch sealing — Soft touch sealing is a copolymer seal for a tank, with characteristics designed for softness, used instead of a metal seal to help avoid fire when sparks are generated.
- spotted flycatcher — a European woodland songbird, Muscicapa striata, with a greyish-brown streaked plumage: family Muscicapidae (Old World flycatchers)
- sub-saharan africa — the region of Africa to the south of the Sahara desert
- sulfuric anhydride — sulfur trioxide.
- ur of the chaldees — the city where Abraham was born, sometimes identified with the Sumerian city of Ur. Gen. 11:28, 31; 15:7; Neh. 9:7.
- weather forecaster — meteorologist
- what has become of — If you wonder what has become of someone or something, you wonder where they are and what has happened to them.