20-letter words containing a, n, m, o, r, p
- transformation point — a temperature at which the transformation of one microconstituent to another begins or ends during heating or cooling.
- upper income bracket — a grouping of the highest earning tax payers
- vertical envelopment — envelopment of an enemy accomplished by parachuting and landing airborne troops at the rear of the enemy's position.
- western roman empire — the westernmost of the two empires created by the division of the later Roman Empire, esp after its final severance from the Eastern Roman Empire (395 ad)
- winter olympic games — an international contest of winter sports, esp skiing, held every four years