The fourth இலக்கிய வகை type: a word borrowed into Tamil from Sanskrit (வடமொழி) - splitting into தற்சமம் (borrowed unchanged) and தற்பவம் (borrowed with its sounds adapted to Tamil).

Every time someone says வேதம் or தியானம், they're using a word Tamil borrowed wholesale from Sanskrit centuries ago - so completely absorbed it no longer feels foreign.

கமலம், வேதம் (தற்சமம்); இடபம், அரி (தற்பவம்).