Since the words among the Arabs are divided into four categories: different words, which are nouns that do not go beyond their nouns, such as the sea, the key, and the scissors, and coexisting words, which are every word that may be used to refer to individuals of some type, such as man and woman, and common words, which are every word that has one form used to refer to. Different meanings, such as the eye, the buyer, the human being, and synonymous words, which are words with different forms given to one meaning, such as the lion, the hazbar, the ghazanfar, the sword, the willow, the harsh, the wine, the nectar, the redhead, and the beard. These are the mothers, such as cold, heat, dryness, and humidity in nature, and then there are similar words, borrowed, transferred, and so on, and all of them are referred to these mothers by convention. And if you say about it that it is like a fifth of the tribes of expressions, such as light, it is applied to the known and to knowledge due