plaud-o (plaus-), I clap (ex-plōdo): plaudit, ap-plause, plausible, explode.
ple-o (plēt-), I fill; plēnus, full: de-plete, complement; expletive.
plĭc-āre (plĭcĭt-), to fold; plect-ĕre (plex-), I weave: du-plicate, implicit, complex; through Fr., ply, reply, display, triplet; replica (Ital.).
plumbum, lead: plumbago; through Fr., plumb, plummet, plunge.
plūs (plūr-), more: plus, plural, plu-perfect, surplus (Fr.).
poena, punishment; pūni-o (pūnīt-), I punish: through Fr., penal, penalty, pain, punitive, impunity, punish.
pōno (pŏsit-), I place: post-pone, deponent, posit, opposite, expositor, depositary; through Fr., posture, position, post, compost, compound.
pŏpulus, people; pūblicus, of the people: popular; public, publish.
porta, gate; portus, harbour; portāre, to carry: through Fr., port, porte, portal, porter, import, etc., portly, deportment, port-cullis, op-portune.
posse, to be able; potens (able): potent, potential, possible.