Here are some other ways to say "hi" in Portuguese, depending on the context:
* "Oi!" (informal, like "Hey!")
* "Bom dia!" (Good morning)
* "Boa tarde!" (Good afternoon)
* "Boa noite!" (Good evening/night)
* "Tudo bem?" (How are you?)
You can also use "E aí?" (What's up?) or "Tudo bom?" (Everything good?) for a more casual greeting.