What is pure mallu?
We know that Malayalam (മലയാളം) is an offspring of Sanskrit and Tamil. As the poem goes:
സംസ്കൃതഭാഷതന് സ്വാഭാവികൌജ്ജസ്സുംSo there are Tamil words and Sanskrit words that are inseparable from the Mallu vocabulary and it is difficult to accurately classify a word to be "obviously" Sanskrit or "obviously" Tamil and if neither, "pure mallu".
But still, I believe, at some level we can talk about a similar, but vague notion. Consider the mallu word for "pure mallu".
- ശുദ്ധമലയാളം is "obviously" Sanskrit
- തനിമലയാളം is "obviously" Tamil, whereas
- പച്ചമലയാളം is "pure mallu"!
Also, there could be situations where a pure mallu counterpart is not available for an "obviously Sanskrit" or "obviously Tamil" word.
So why bother with this "incomplete", artificial "pure mallu"?
I believe looking for "pure mallu" alternatives helps in analyzing the etymology and history of mallu words. It helps us know when, if at all, they crossed over from the realm of pure Tamil or pure Sanskrit into the mallu world. Some words didn't cross over - and it is interesting to study them too. They help delineate concepts that were originally mallu from concepts that were borrowed from Sanskrit or Tamil sub-cultures.