Formal:
* Sahabat: This is the most formal and general term for friend.
* Rakan: This is another formal term for friend, often used in professional contexts.
Informal:
* Kawan: This is the most common and informal word for friend.
* Teman: This is similar to "kawan" but can also be used for someone you hang out with but wouldn't necessarily consider a close friend.
Other terms:
* Saudara: This word literally translates to "brother" but can also be used for a close friend, especially someone you consider like family.
* Sahabat karib: This literally translates to "close friend" and is used to describe someone you have a strong bond with.
The best choice of word will depend on the specific context and the relationship you want to express.