Formal:
* বন্ধুবান্ধব (bondhubandhob) - This is the most formal way to say "friends," and it's often used in writing or when addressing a group of people you don't know well.
Informal:
* বন্ধু (bondhu) - This is the most common way to say "friend," and it's used in everyday speech.
* মিত্র (mitra) - This word is also used for "friend," but it's slightly less common than "bondhu" and can also mean "ally" or "companion."
* সাথী (sathee) - This word means "companion" or "associate," and it can also be used to refer to a close friend.
Other:
* সঙ্গী (songi) - This word means "companion" or "associate," and it's often used to refer to someone who is close to you.
The best way to choose the right word depends on the context of the conversation. If you're not sure, it's always safe to use "বন্ধু (bondhu)."