Muciparous is a term that is used to describe an organism or a substance that produces a lot of mucus. It is quite a specific term and synonyms for this word are somewhat limited. One possible synonym is the term "mucous-producing." Another option could be "mucus-secreting" or "muciferous." Other related terms that might be used in a similar context include "phlegm-producing," "sputum-producing," or "expectorant." Ultimately, the choice of synonym will depend on the context in which it is being used, as well as the level of specificity that is required.