1. aboard

Today we are going to learn “aboard”.If you are aboard a ship or plane, you are on it or in it.
(1) Good morning,ladies and gentlemen! I’m Captain Mills. Welcome aboard! (when welcoming guests on plane)
(2) Good morning, Linda. Welcome aboard! This is Professor Crystal. (when welcoming your boss)

2. above

Another word is “above”. It means in a higher position than something else.
(1) I heard a strange noise coming from the room above.
(2) We must be polite, above all, to old people.