What is the diffence between Bhagwan, Ishwar and Parmeshwar

In Hinduism, some time large number of people get confused on words like Bhagwan, Ishwar and Parmehswar. Some time they think that Bhagwan, Ishwar and Parmehswar all are synonyms. But that's not true, actually all these three are much different in meaning. In vedas, upanishad and Puranas, meaning is written for these word. Even these words also describes their name self. Only need to under stand the word and conjugational meaning  of word. Here, Bhagwan means the great person who born from Vagina. In Sanskrit,     Vagina is also called as Bhag. Normally, all human being and other living creature born through Vagina (Bhag). But among these normal human being and living creature who ever is great and extraordinary. That person is depicted as Bhagwan. That why, Krishna, Ram, Parshuram are depicted as Bhagwan. In puranas, it has been described that after death, soul is taking birth in different yonis. These yonis are described as 1 lakh yonis are there. Here yoni mean taking birth in any form of living creature either human, fly, mosquitos, dog, horse or snake etc. The creature who have not born from Vagina but having human body somehow and having extraordinary things are also depicted as Bhagwan like narshing and Varaha.
   
                                And meaning of Ishwar is different from Bhagwan. Ishwar means master in some part. Ishwar means to control something and having power to control that area. For example, Agni is god of fire can be called as ishwar because Agni can contolled and ignite fire. Pawan is god of Air, is similarly may called as ishwar because he has controlled and regulate any kind of air. Other ishwar are Kuber (God of wealth), Yama (God of death), Shani (God of justice).
        Now we will focus on meaning of Parmeshwar. Parmeshwara means master of all master. This is the supreme soul. He is real almighty. All these ishwaras means master of some parts are controlled by only one great master. That single great master is depicted as Parmehswar. There is two form of a great master means Parmeshwar. One is nirankar form means without shape and second is saakar form means with shape.    Lord Brahma, Vishnu and Shiva are the saakar forms of great master (Parmeshwar). They are not depicted as Bhagwan. But some people's describes them as Bhagwan, even these three having divine body. These three never take birth at any time and they will never die at any time. Hence they are called as Parmeshwar. All bhagwanas and ishwaras have to changes there body at specific interval of time. But Parmeshwar never do this at any time.