Capital gain
Profit that is obtained if a property is sold above its purchase price.

Gross Profit
The profit you get from the investment without taking into account the taxes you pay. In the real estate sector, it would be the annual rent received against the total investment made.

The income you receive against the total amount of the investment.

Anglo-Saxon term relating to profitability. It is the term most used in the real estate sector when talking about profit.