The main purpose of this research is to study the relationship between verbal working memory an morphological complexity of words. Hungarian as an agglutinative language is of special interest for psycholinguistic inquiries in morphology. The authors present three word-recall experiments. The recall of words was measured by the classical span design. The item lists consisted of 2 syllable stems and 2 syllable morphologically complex words (stem + suffix). Within one list the words were of the same length, the same phonological structure (CVCVC), the same fluency and the same concreteness. The experimental design was the same with 3 syllable words as well. The capacity of the phonological loop was measured by digit span and non-word repetition. Results indicated that morphological complexity has a significant effect on word span. Partial correlation analysis suggests that the effect of the phonological loop on morphologically complex words is mediated by stems rather than suffixes.