18-letter words containing a, b, k
- westinghouse brake — a railroad air brake operated by compressed air.
- whittaker chambers — Robert, 1802–71, Scottish publisher and editor.
- wingback formation — single wingback formation.
- yerkes observatory — an astronomical observatory located in Williams Bay, Wisconsin, affiliated with the University of Chicago, and having a 40-inch (102-cm) refracting telescope, the largest refractor in the world.