Kar sevak or Kara sevaka Sanskrit?

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Common words in a well-documented language are not up for contention, but they can be found out. The likelihood of a given form can also be found out; the presence or absence of short final "a" is a telltale sign in the development of Northern Indian languages. This case is obviously suspicious to everyone with a basic knowledge about (not necessarily in) Sanskrit, but for precisely that reason it can also be difficult to find generally acceptable sources online. Anyhow, I can't do it right now.

As for the source for "kar sevak" being Sanskrit, this one is not linguistic. It can also have been misunderstood, which is common enough.

(Unable to find tildes on the phone, but there is the edit history.) -- — Preceding unsigned comment added by 151.177.57.24 (talkcontribs)