One of the reasons I had posted this link was this article.
VOL. 18 (2011), ISSUE 1 (February 16)
Pleonastic Compounding: An Ancient Dravidian Word Structure
by
Periannan Chandrasekaran
The paper is important for several reasons: it reveals a unique form of compound
nouns in Proto-/EarlyDravidian, and as such it is quite relevant for the
etymology of a number of Dravidian loans into Sanskrit.