16-letter words containing i, p, s, o, f
- spring snowflake — a European amaryllidaceous plant, Leucojum vernum, with white nodding bell-shaped flowers
- step out of line — to fail to conform to expected standards, attitudes, etc
- stonecrop family — the plant family Crassulaceae, characterized by succulent herbaceous plants and shrubs with simple, fleshy leaves, clusters of small flowers, and dry, dehiscent fruit, and including hen-and-chickens, houseleek, kalanchoe, live-forever, orpine, sedum, and stonecrop.
- sulfanilyl group — the para form of the group C 6 H 6 NO 2 S–, derived from sulfanilic acid.
- superfecundation — the fertilization of two or more ova discharged at the same ovulation by successive acts of sexual intercourse.
- superunification — a theory intended to describe the electromagnetic force, the strong force, the weak force, and gravity as a single, unified force.
- the first couple — the US president and their spouse
- windfall profits — Windfall profits are excessive profits with a non-business cause such as a natural disaster.
- 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