From Latin to Romance - Hal-SHS
... an agent noun in -tor (quaestor → quaestūra) have not survived, unlike the action nouns
derived on a verbal base (cf. section 4.1.3.).
Most of the time, this type of suffixation itself disappeared. A derivative in -tūs, -tūtis
has survived, e.g., virtūs ‘virtue’, but the model itself disappeared wi ...