What is the Difference Between Similar But Different Things, Terms, and Objects

What is the Difference between Grapefruits Oranges Tangerines Mosambi Mandarin Clementines

There are many types of fruits in the world. They are different in their colors, taste and health effects. However, many fruits have some sub-classes as well. Orange, grapefruit, tangerine, moosambi, mandarin and Clementine are the names of similar fruits, but different from each other in terms of nutrition and taste.