Durus, hard; durable, obdurate, duration.
Emo (empt-um), I buy; redeem, exemption.
Eo (it-um), I go; exit, transit, circuit, ambition.
Equus, a horse; equine, equestrian.
Erro, I wander; error, aberration.
Esse, to be; essential, essence.
Facies, the face; facial, facet, superficial.
Facilis, easy; facile, facility, difficult.
Facio (fact-um), I make; manufacture, factor, faction.
Fallo (fals-um), I deceive; false, infallible, fallacious.