Formal:
* मित्र (mitra) - This is the most common and general word for "friend".
Informal:
* मैत्रिण (maitrin) - This is used for a female friend.
* **मैत्र (mait) - This is used for a male friend.
* सखा (sakha) - This is a more poetic and informal way to say "friend", typically used for close friends.
* मित्र (mitr) - This is a shorter version of "मित्र" and is more casual.
You can also use the phrase "माझा मित्र" (maja mitra) which means "my friend".
The choice of which word to use depends on the specific context. For example, if you're talking to a close friend you might use "सखा" or "मित्र", but if you're talking about a casual acquaintance you would use "मित्र".