The answer is that such uses are either according to the...

The answer is that such uses are either according to the beliefs of the addressees, or uttered by the disbelievers - the case in which it means "the thing which, according to the listener's, or the speaker's, belief, is worthy of worshipping". Thus, even in such instances the Intended meaning of the word is also "worthiness", though from the point of view of the addressee or the addresser.

As to "rabb", which means "educator", "nourisher" or "breeder", originally meant "the owner", as is gathered…