The term 'belonging to the same genus' can be expressed in two five-letter words: CASTE and DITTO. CASTE is a system of social stratification based on birth, which is found in many societies around the world. It is typically associated with Hinduism, but it is also found in other religions. DITTO is a term used to indicate that something is the same as what has already been said or written. It is often used to indicate agreement or to repeat something that has already been said.