1. Zdravo ( pronounced : [ˈzdɾaʋɔ] )
2. Cao ( pronounced : [t͡saːo])
"Zdravo" is the more formal greeting and is used in most situations. "Cao" is a more informal greeting and is used among friends and family.
Here are some additional greetings you can use in Montenegro:
Dobar dan (pronounced [ˈdɔbar dan]) - Good day
Dobro jutro (pronounced [ˈdɔbrɔ ˈjutrɔ]) - Good morning
Dobra večer (pronounced [ˈdɔbra ˈvɛtʃɛr]) - Good evening
Laku noć (pronounced [ˈlaku nɔt͡ɕ]) - Good night
Doviđenja (pronounced [dɔvidʑeɲa]) - Goodbye