20-letter words containing u, n, b, o, s
- tropical disturbance — a very weak, or incipient, tropical cyclone.
- twiddle one's thumbs — to turn about or play with lightly or idly, especially with the fingers; twirl.
- 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.
- wilson cloud chamber — cloud chamber.