gens vs tribe

gens

noun
  • A tribal subgroup whose members are characterized by having the same descent, usually along the male line. 

  • A legally defined unit of Roman society, being a collection of people related through a common ancestor by birth, marriage or adoption, possibly over many generations, and sharing the same nomen gentilicium. 

  • A host-specific lineage of a brood parasite species.^([W]) 

tribe

noun
  • An ethnic group larger than a band or clan (and which may contain clans) but smaller than a nation (and which in turn may be contained within a nation). The tribe is often the basis of ethnic identity. 

  • A hierarchal rank between family and genus. 

  • A socially cohesive group of people within a society 

  • A family of animals descended from some particular female progenitor, through the female line. 

  • A tribal nation or people. 

  • The collective noun for various animals. 

  • A group of apes who live and work together. 

  • A nation or people in an area considered culturally primitive, such as Africa, Australia or Native America. 

verb
  • To distribute into tribes or classes; to categorize. 

How often have the words gens and tribe occurred in a corpus of books? (source: Google Ngram Viewer )