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

It has developed unique elements, such as the Newar caste system, in which the roles of the Buddhist community are determined by a hereditary caste system,

Newar devotionalpauba and thanga painting, sculpture and metal craftsmanship are world-renowned for their exquisite beauty The fine temples and palaces of

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

newar NEWAR definition: a member of a people living in and around the Kathmandu Valley in Nepal