16-letter words containing s, p, t
- world exposition — world's fair.
- writ of subpoena — a legal document commanding the attendance in court, as a witness, of the person on whom it is served, under a penalty
- xenotransplanted — Transplanted by xenotransplantation.
- yah-boo politics — adversarial politics in which politicians constantly deride their opponents and dismiss everything suggested by them
- zenith telescope — a telescope mounted to point only at the zenith, used at some observatories for measuring time by the stars.