This study aims to determine the nature of the correlational relationship between morphological awareness and vocabulary knowledge. Its sub-objectives are firstly, to verify the existence of a statistically significant correlation between the components of morphological awareness and the dimensions of vocabulary knowledge, and secondly, to identify the nature of the impact of morphological awareness on learners' vocabulary size. The researchers administered a test kit consisting of three main tests for morphological awareness and three other tests for the dimensions of vocabulary knowledge. This was done to measure the interactive relationship between morphological awareness and its impact on developing the vocabulary size of third-year preparatory school students. A descriptive approach was used to achieve the research objectives. The results of the study showed statistically significant correlations between the components of morphological awareness and the dimensions of vocabulary knowledge among learners. The findings also emphasized the effective role that morphological awareness, in its various forms, plays in developing and enhancing learners' vocabulary size. The study tests revealed that understanding the established relationship between the components of morphological awareness and the dimensions of vocabulary knowledge, along with realizing their relationships and manifestations, can provide a correct direction for formulating educational curricula and programs. This understanding can also inform the building of appropriate and sound foundations and strategies for the educational content adopted in school books, in a manner consistent with cognitive linguistic strategies to enhance the vocabulary size of preparatory school students.

Morphological awareness, Vocabulary knowledge, Arabic language, Secondary preparatory education

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