Orthos, right; orthodoxy, orthography.
Pais (paid-os), a boy; pedagogue [lit. a boy-leader].
Pan, all; pantheist, panoply, pantomime.
Pathos, feeling; pathetic, sympathy.
Pente, five; pentagon, pentateuch, Pentecost.
Phainŏmai, I appear; phantasy, phantom, fantastic, fancy.
Phero, I bear; periphery, phosphorus [= the light-bearer].
Phileo, I love; philosophy, Philadelphia.
Phōs (phōt-os), light; photometer, photograph.
Phusis, nature; physics, physiology, physician.