The term used to denote a group of families in the vedic society was

The Kula i.e. the family was the basis of both social and political organisations. Unit of Kula (the family) is headed by Kulapa.
The Grama was above the Kula. A group of Kula (families) formed a Grama (the village). Unit of Grama (the village) is headed by Gramani.
The Vis was above the Grama. A group of Grama formed a Vis. Unit of Vis (the clan) is headed by Vispati.
The Jana was above the Vis . A group of Vis formed a Jana. Unit of Jana (the people) is headed by Gopa or Gopati.
The Rashtra was above the Jana . A group of Jana formed a Rashtra. Unit of Rashtra (the country) is headed by Rajan.