Variety, Varietal, Cultivar
All three terms have been used to refer to the various forms of coffee grown around the world.
Cultivar, selections and forms of cultivated plants; it must be visually distinct from other cultivars, and it must be possible to propagate it reliably.
Variety a more common and more popular term for cultivar, especially in wine.
Varietal is a wine made from or belonging to a single specified variety of grape. The coffee industry has somewhat adopted this term, but instead of using it to refer to a coffee of a specific variety or cultivar (e.g., Bourbon coffee), it is used in the place of the term variety or cultivar.
Read more about this topic: List Of Coffee Varieties