20-letter words containing b, o, u, r, d, n
- skull and crossbones — a representation of a front view of a human skull above two crossed bones, originally used on pirates' flags and now used as a warning sign, as in designating substances as poisons.
- standard book number — International Standard Book Number. Abbreviation: SBN.
- subscription edition — an edition of one or more volumes for which a number of prospective purchasers place orders, usually in advance of publication.
- to be on dinner duty — to be responsible for preparing an evening meal
- tropical disturbance — a very weak, or incipient, tropical cyclone.
- under/below strength — If an army or team is under strength or below strength, it does not have all the members that it needs or usually has.
- war production board — the board (1942–45) that supervised and regulated the production and sale of matériel essential to the logistics of World War II. Abbreviation: WPB, W.P.B.
- wardrobe malfunction — an embarrassing situation caused by the clothes a person is wearing
- wilson cloud chamber — cloud chamber.