por'os, a passage—pore, porosity, porous, emporium.
pot'amos, a river—hippopotamus.
pous, the foot—antipodes, polypus, tripod.
pras'sein, to do—practice, practical, practitioner, impracticable.
presbu'teros, elder—presbytery, presbyterian, presbyterianism.
pro'tos, first—protomartyr.
psal'lein, to touch, to sing—psalm, psalmist, psalmody, psalter.
pur, fire—pyramid, pyrotechny.
rhin, the nose—rhinoceros.
rhod'on, a rose —rhododendron.