Genus Aythya is a group of diving ducks belonging to the family Anatidae. There are several synonyms for this genus, including the following:
1. Sea ducks: This term is used to describe diving ducks that are commonly found in saltwater environments.
2. Ring-necked ducks: This name comes from the distinctive white ring around the neck of some members of the genus Aythya.
3. Pochards: This term is derived from the French word 'pochard' which means 'diver' and is used to describe diving ducks.
4. Canvasbacks: This name is used to describe a specific species within the genus Aythya known for their striking red heads and intricate feather patterns.
5. Redheads: This name is used to describe another species within the genus Aythya known for their distinct red heads.