20-letter words containing i, b, l, s
- webbing clothes moth — a small brown moth, Tineola biselliella, the larva of which feeds on woolens and spins a web when feeding.
- westminster assembly — a convocation that met at Westminster, London, 1643–49, and formulated the articles of faith (Westminster Confession of Faith) that are accepted as authoritative by most Presbyterian churches.
- white bush (scallop) — a variety of summer squash having a saucer-shaped white fruit, scalloped around the edges
- wilson cloud chamber — cloud chamber.