Variety of plum is a term used to describe the different types of plums that exist. The three most common varieties are DAMSON (6 letters), GAGE (4 letters) and GREENGAGE (9 letters). DAMSON is a small, dark purple plum with a tart flavor. GAGE is a medium-sized yellow or green plum with a sweet flavor. GREENGAGE is a large, green plum with a sweet flavor. All three varieties are popular for making jams, jellies, and other desserts.