Overtop and Upper

Overtop verb - To be greater, better, or stronger than.

Upper and overtop are semantically related in position topic. In some cases you can use "Upper" instead an adjective "Overtop", when it comes to topics like place.

Upper adjective - Higher in place or position.

Overtop and upper are semantically related in position topic. Sometimes you can use "Overtop" instead an adjective "Upper", if it concerns topics such as place.