Nanjil Tamil is the outcome of several centuries of administration in Malayalam over a Tamil-speaking countryside, and it shows in exactly the places contact usually shows — kinship words, household vocabulary, food names and place names — rather than in grammar. The other half of the picture is that Malayalam is not merely a substrate here but a living minority language with its own schools, churches and newspapers in the western taluks. Speakers move between the two without treating either as foreign, which is a normal condition here and an unusual one anywhere else in Tamil Nadu.
Nanjil TamilDravidian — Tamil
Tamil with a large Malayalam lexical layer, a distinct intonation, and vocabulary — kappa for tapioca, kodampuli for the souring fruit — that a speaker from Madurai would need explained. Tamil writers from this district are recognisable in print by it.
बोलने वाले: Across the district
Kanyakumari MalayalamDravidian — Malayalam
A recognised linguistic minority with Malayalam-medium schooling and church use, continuous with the Malayalam spoken across the Ghats rather than a separate island of it.
बोलने वाले: The western taluks, particularly Vilavancode and Kalkulam
Coastal parish TamilDravidian — Tamil
A fishing and navigation vocabulary of its own, a stock of Portuguese-derived everyday words shared with the coast to the north — jannal for a window, mesai for a table, alamari for a cupboard, koppai for a cup — and given and family names from the same source.
बोलने वाले: The Latin Catholic fishing villages from Colachel to Manakudy