Special-interest groups
A group of people with the same political ideas
One can call a group of people with similar interests 'friends.' One becomes friends with another because they share a similar interest. One can have many friends that share the same interests as each other.
a fleet
Enviorment
a religious group is a group of people that have the same religion.
Offspring who have the same parents are called siblings.
It should be stuck together in a group of gears and the gear module is the same.
A crayfish is a crustacean that has a similar appearance to the shrimp. When referring to a group of crayfish you simply call them by the same name.
A group of people who are related are known as a family.
uniform
A group of people who share the same ancestors, culture, language, or religion is commonly referred to as an ethnic group.