This morphological and grammatical study aims at studying agreement of derivative nouns and their function in the poetry book of Suleiman Al Nabhani with grammatical and morphological rules. The study emphasizes how this agreement influences semantic aspects of language. The study followed a descriptive methodology. This methodology describes derivative nouns in terms of their morphological forms and grammatical functions. An applied methodology was also used in the study of derivative nouns in Al-Nabhani's poetry book and their grammatical and morphological aspects. Derivative nouns in this book will also be compared with the rules set by scholars of grammar and morphology. Statistics was also used in the study in the areas of counting and classifying forms of each derivative noun, the significance of repetition of some lexical items, and the occurrence of some derivative nouns more than others. The study has arrived at several results. First, meaning and rhyme, and. even poetic themes, in the poetry of Al-Nabhani have a decisive role in the derivative noun used, both in terms of quantity and quality. It was also shown that Al-Nabhani's poetry complies with several morphological and grammatical rules of derivative nouns. The study has also drawn attention to the occurrence of several forms that are shared between derivative nouns and the role of meaning in defining them. The study also gave explanation to the grammatical location of some derivative nouns. The author believes that this area is an area that requires more research. There are many linguistic issues that have not hitherto been studied and that require deep analytical research. Some of the most important areas include the role that is played by rhyme in defining forms, significance of the grammatical locations of words, presence of colloquial and Arabicized words in the language of poetry, dictionary studies, significance of some styles like repetition, negation and exception, and finally the study of forms and words in terms of their singular, dual and plural aspects