21-letter words containing p, a, t, r, i, l
- ulster unionist party — a Northern Irish political party advocating the maintenance of union with the UK
- uncertainty principle — the principle of quantum mechanics, formulated by Heisenberg, that the accurate measurement of one of two related, observable quantities, as position and momentum or energy and time, produces uncertainties in the measurement of the other, such that the product of the uncertainties of both quantities is equal to or greater than h/ 2 π, where h equals Planck's constant.
- west university place — a city in SE Texas.
- white-knuckle paddler — an inexpert and timid canoeist.
- wildlife photographer — someone that specializes in taking photographs of wild animals, especially in their natural habitats, and plants
- with a capital letter — (used to give emphasis to a statement)