Over and Upon

Over adjective - Brought or having come to an end.

Upon is a synonym for over in part of speech topic. In some cases you can use "Upon" instead the word "Over" as a preposition or an adverb or an adjective, when it comes to topics like on, on top of, of, to.

Upon preposition - In or into contact with.

Over is a synonym for upon in part of speech topic. You can use "Over" instead the word "Upon" as a preposition or an adverb or an adjective, if it concerns topics such as position, on, of, to.