Genus Bennettitis refers to a type of extinct plant that existed during the late Carboniferous period. While there are no direct synonyms for the exact term, there are related terms for the classification of extinct plants. These include the order Cordaitales, which is the group of extinct, tree-like plants that included Bennettitis. Within Cordaitales, there are several genera, including Cordaites, Pseudomonophyllum, and Cathaysiopteris. These genera all share similar features with Bennettitis, such as elongated leaves and woody stems. While the name Bennettitis is specific to one particular genus of extinct plants, there are related terms that provide insight into the diverse range of flora that existed during this period.