in tamil, there is a single consonant for ka, kha, ga and gha
similarily there is no jha in tamil. you have to substitute with tcza
but still it is a glories language not because of periyar movement but this language was totally used by the 12 alvars to praise LORD KRISHNA in their DIVYA PRABHANDAMS.
this is where the tamils counter themselves. they donot accept GOD so donot consider the rich tamil existing in divya prabhandams.