Why is Newar considered a caste not a community or a civilization?

Why is Newar considered a caste not a community or a civilization? newar Newar known officially in Nepal as Nepal Bhasa, is a Sino-Tibetan language spoken by the Newar people, the indigenous inhabitants of Nepal Mandala, newar Newar Traditional Motifs and Designs : Ram Prakash Shrestha: : Books

newar Land, Lineage and State: A Study Of Newar Society In Mediavel Nepal : Unknown Author: : Books

newar Read about Sumit Newar cricket player from Nepal profile, stats, rankings, records, videos, photos at ESPNcricinfo  Newar people of Nepal Newars are a traditional merchant and trading caste that are prominent in old urban areas of Nepal; like Kathmandu Before the