Traditionally, the person who is in a position of authority or the one who is more senior might say good morning first, but it's generally a matter of personal preference and social context. In casual settings, it’s often seen as friendly and polite for anyone to initiate the greeting. Ultimately, the goal is to foster a positive interaction, so either party can take the initiative.
The person entering the room should say Good Morning first. I never say it to the person rude enough to walk in without greeting the people who are already in.
good morning
Buenos días.
* You can say good morning to anyone you please and it's a pleasant salutation and that would be up to just before 12:00 Noon.
A brief greeting. Such as... Good morning. Good morning, I hope everyone is doing well today.
You could say, "Good morning, [her name]! I hope you have a wonderful day."
To say good morning in Dhivehi, you have to say "goedemorgen".
good morning
Good morning.
good morning
good morning
good morning