Explanation of the statement of Ibn Malik (may Allah have mercy on him): Morphology.

The Shaykh : Morphology is the science by which the rulings of the word are known, in terms of its modification and its reduction to the roots by addition or deletion. It does not concern the ends of words, but rather their beginnings and middles, whether there is modification or not, and likewise their patterns, whether there is addition or diminution. In reality, its benefit is not like the benefit of grammar, because the benefit of grammar is extremely great, but morphology also has a great benefit. By it, one knows how the word moves in its beginning and in its middle, such as whether it is from this chapter or from that chapter, as will come if Allah wills. Morphology does not apply to all words, and for this reason he says.