Here's a breakdown:
* அண்ணன் (annan): This is the most common word for older brother.
* தம்பி (thampi): This word means "younger brother."
* சகோதரன் (sakodharan): This is a more formal word for "brother" that can be used for both older and younger brothers.
So, depending on the context and the age of the brother, you can use any of these words.