For and On

For conjunction - For the reason that.

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

On adjective - Being in effective operation.

For and on are semantically related in toward topic. Sometimes you can use "For" instead a preposition "On", if it concerns topics such as over, by, of, towards.