20-letter words containing m, i, l, b
- 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 people problem — a fairly minor problem, complaint, etc., associated with a relatively high standard of living; a first world problem.
- wilson cloud chamber — cloud chamber.
- yellow-billed magpie — either of two corvine birds, Pica pica (black-billed magpie) of Eurasia and North America, or P. nuttalli (yellow-billed magpie) of California, having long, graduated tails, black-and-white plumage, and noisy, mischievous habits.