The present study aimed to investigate the overall and relative contribution of four subcomponents of vocabulary knowledge to reading comprehension. The four vocabulary subcomponents were vocabulary size, word association knowledge, collocation knowledge, and morphological knowledge. The participants were 124 college students from a university in Taipei, Taiwan. Six instruments were employed: (1) a reading comprehension test, (2) a vocabulary size test, (3) a test on word association knowledge and collocation knowledge, (4) a test of morphological knowledge, (5) motivation attitude scale, and (6) a self-efficacy scale. The results can be summarized as follows. First, after the effects of motivation and self-efficacy have been controlled, the four vocabulary subcomponents altogether contributed significantly (20%) to reading comprehension performance. Moreover, depth of vocabulary knowledge (including word association knowledge, collocation knowledge, and morphological knowledge) provided an additional explained variance (6%) in reading comprehension performance over and above vocabulary size. Finally, among the three subcomponents of depth of vocabulary knowledge, collocation knowledge explained the most proportion of variance (5.6%) in contributing to performance on reading comprehension. Based on these findings, some implications and suggestions for future research were provided.
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