The Arabic language is like the rest of the languages. It was set by the Arabs and they made conventions of its Alfaazh (wordings) and upon the composition of these wordings into sentences. It is therefore from the conventions of the Arabs and it is not Tawqeefiy (a fixed setting) from Allah. Rather it is Tawfeeqiy (through a process of reconciliation) meaning that the Arabs agreed upon it. So for instance they set and placed down the word ’ (Rajul) for the mature male and they placed down and provided the word ‘ ة َ(‘Imra’ah) for the mature woman (i.e. post-pubescent) and so on…