The term 'prefix for centric' refers to two words that are commonly used to describe something that is focused on a particular group or area. The two words are 'ethno' and 'geo', which both have five and three letters respectively. Ethno is derived from the Greek word ethnos, meaning 'PEOPLE' or 'NATION'. It is used to refer to something that is related to a particular ethnic group or culture. Geo, on the other hand, is derived from the Greek word geographia, meaning 'earth description'. It is used to refer to something that is related to a particular geographical area or region.