The automatic compilation of bilingual dictionaries from comparable corpora has been successful for single-word terms (SWTs), but remains disappointed for multi-word terms (MWTs). The increase of coverage of bilingual dictionary thanks to compositional translation improved the results, but still shows some limits for MWTs of different syntactic structures. In this paper, we propose to bridge the gap between syntactic structures through morphological links. The results show a significant improvement in the compositional translation of MWTs that demonstrate the efficiency of the morphologically based-method for lexical alignment.