Domina- Female form of the masculine Dominus meaning "Master". This is the term with which a slave or servant would refer to his or her mistress. It is the origin of the word "Dominate".
Villa- Upper-class country house.
Denarius- A small silver coin first minted in 211 BC which was the most basic coin in circulation, much like the penny or one-pence coin today. It's value was debased through decreases in it's weight over time, and it was eventually replaced by the antoninianus.
Forum- Marketplace, much like a city-center today it was a hub of commerce and daily ritual.
Via- Road. The Romans built extensive road networks for transporting troops and goods across the empire. Some examples include the Via Latina, Via Labicana, and Via Appia (aka the Appian Way) leading to Rome (as I've heard all roads do).