Going from Malayalam to Tatar (Татарча) has a composite linguistic distance of 86% (heuristic estimate). Below is the dimension-by-dimension breakdown.
Shared vocabulary, cognates, and loanwords.
Morphology, syntax, word order, cases.
Shared sounds and phoneme inventory.
Malayalam → Cyrillic
Dravidian ↔ Turkic
The 5 languages with the lowest linguistic distance from Malayalam:
A quick 3-question check between Malayalam and Tatar. No signup.