[{"Bold_text": "preposition", "List Items": ["against; in opposition or contrast to:Consider the problems of the teenager contra those of the adult."]}, {"Bold_text": "adverb", "List Items": ["contrariwise; on or to the contrary."]}, {"Bold_text": null, "List Items": ["a prefix meaning “against,” “opposite,” “opposing”:contradistinction, contraindicate."]}, {"Bold_text": "noun", "List Items": ["(often initial capital letter)a member of a counterrevolutionary guerrilla group in Nicaragua."]}, {"Bold_text": null, "List Items": ["a prefix meaning “pitched lower than” the voice or instrument specified by the following element:contralto, contrabassoon."]}]