20-letter words containing o, b, s, l
- 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.
- webbing clothes moth — a small brown moth, Tineola biselliella, the larva of which feeds on woolens and spins a web when feeding.
- white bush (scallop) — a variety of summer squash having a saucer-shaped white fruit, scalloped around the edges
- wilson cloud chamber — cloud chamber.
- yellow-breasted chat — an American warbler, Icteria virens, having a yellow throat and breast and greenish-brown upper parts and noted for imitating the songs of other species.