The preposition or is used to signify a list of possibilities out of different things. For example-
Which one should I use- apple or banana?
The two fruits are different and the one is required to one among them. But some people do use or for synonyms like:
Mister Narendra Modi or the prime minister of India is very hard working.
This kind of system is known as Q system or fixed order system or reorder system.
This physical quantity is called as the resistor (of the circuit) or the real impedance of the circuit.
In all the three examples above, the terminologies used after or are implying the same thing. The first sentence could be put as:
Mister Narendra Modi or more specifically the prime minister of India is very hard working.
Except this sentence why should or be used for listing the same thing while it is used for selecting from different things.