On and Per

On adjective - Being in effective operation.

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

Per adverb - For each one.

On and per are semantically related in over topic. Sometimes you can use "On" instead a preposition "Per", if it concerns topics such as by, of, to.