Over and Onto

Over adjective - Brought or having come to an end.

Onto and over are semantically related in across topic. In some cases you can use "Onto" instead a preposition "Over", when it comes to topics like of, to, per.

Over and onto are semantically related in of topic. You can use "Over" instead the word "Onto" as an adjective or a preposition, if it concerns topics such as to, per, upon.