22-letter words containing p, e, n, o, l, g
- the-leaning-tower-pisa — a round, marble campanile in Pisa, Italy, begun in 1174 and now 17 feet (5.2 meters) out of the perpendicular in its height of 179 feet (54 meters).
- to open the floodgates — If events open the floodgates to something, they make it possible for that thing to happen much more often or much more seriously than before.
- turbo-propeller engine — a jet engine with a turbine-driven propeller that produces the principal thrust, augmented by the thrust of the jet exhaust.
- zero population growth — the maintenance of a population at a constant level by limiting the number of live births to that needed to replace the existing population.