Avestan and Vedic

Hi,

Where can I find lists of words concordant in Vedic and Avestan
but which have no proto-IE forms? [(e.g. us.t.ra (camel), ks.i_ra
(milk), mes.a (sheep)] or, am I wrong with this sample?

I am sorry if this is a repeat message. Thanks in anticipation for
your guidance.

Dr. S. Kalyanaraman