For and Upon

For conjunction - For the reason that.

Upon and for are semantically related in on topic. In some cases you can use "Upon" instead a preposition "For", when it comes to topics like over, of, per.

Upon preposition - In or into contact with.

For and upon are semantically related in on topic. Sometimes you can use "For" instead a preposition "Upon", if it concerns topics such as over, of, per.