The purpose of this study is to show that using practical vocabulary learning activities can stimulate EFL learners" vocabulary enhancement through making sentences. Language practice with productive lexical output can be a very helpful way for EFL students to integrate their prior linguistic knowledge with newly-gained words, which will enhance their communicative performance. One hundred twenty students (n=120) performed two different activities (sentence-building with instructional feedback and rote-memorization), and their performances were examined by the text length in terms of lexical proficiency. The results of this study reveal that the experimental group (n=60) with sentence-building with instructional feedback seemed to evoke their lexical input and output together and did better at both than the control group (n=60) with rote-memorization. In vocabulary knowledge enhancement, the experiment group showed that they were likely to transfer a large amount of vocabulary they practiced to their language output effectively. With respect to vocabulary performance, the experimental group formed more meaningful structures with a longer sentence than the control group. This study implies that sentence-building as a language practice can be an effective way to incorporate a learner"s lexical knowledge into meaningful language use, and can lead to better communicative performance in English.