Formal:
* மாமா (Maama): This is the most common and general term for uncle, used for any paternal uncle.
* சின்னப்பா (Chinnaappa): This means "younger uncle" and is used for a younger paternal uncle.
* பெரியப்பா (Periyaappa): This means "elder uncle" and is used for an elder paternal uncle.
Informal:
* அண்ணா (Anna): This means "older brother" and can be used for an older paternal uncle who is close to you.
* தம்பி (Thambi): This means "younger brother" and can be used for a younger paternal uncle who is close to you.
* மாமா (Maama): This can also be used informally, especially for a younger paternal uncle.
Other:
* அத்தான் (Aththan): This is used for a maternal uncle.
* மச்சான் (Macchan): This means "brother-in-law" but can also be used for a close paternal uncle, especially if you are a male.
The specific word you choose will depend on the age and relationship you have with the uncle.
It's always good to ask your parents or other family members how they refer to their uncles to get the most accurate and culturally appropriate term.