Hi there!

The anther and pollen grain are both parts of the male reproductive organ of the flower called the stamen. The main difference between the two are as follows:

• Anther is a locular structure that produces pollen grains during its maturation, while pollen grain is a granular structure that contains the male gametes.
• Pollen grains are embedded in the anther, while the anther produces pollen grains.

Thanks