voco

Voco, vocare, vocavi, vocatum, first conjugation and completely regular, which is worth noticing in a list where so little else is.

It is built on vox, vocis, and it reaches everywhere English "call" reaches: summon a person, name a thing, invoke a god. In the passive it is the ordinary way to say what something is called, urbs Roma vocatur, and it takes a second nominative rather than any preposition. Naming can also take a double accusative in the active, lucem diem vocavit. The compounds are heavily used: convoco, invoco, revoco, provoco, evoco, advoco. From advoco comes advocate and, through Norman French, avow and vouch; vocatio, "a calling", becomes vocation, and the grammarian's vocative is the case you call somebody by.