Bignoniaceous is an unusual word, used to describe a family of plants native to the tropical regions of the Americas. If you're searching for other words to describe these plants, you might consider using the terms trumpet vines, catalpas or jacarandas, all of which are common members of the bignoniaceous family. Other synonyms for bignoniaceous could include trumpet creeper, angel's trumpet, and golden rain tree, all of which are used to describe specific species within the family. No matter what word you choose, these plants are known for their striking, brightly-colored flowers and lush, tropical foliage.