"Oppugnancies" is a rarely used word that means opposition or resistance. There are many synonyms that can be used to convey the same meaning such as antagonism, hostility, confrontation, contention, and defiance. Other synonyms may include opposition, objection, contrariety, obstruction, and challenge. Depending on the context in which the word is used, additional synonyms that might fit include rebellion, resistance, dissent, or contrariness. The use of synonyms can provide more depth and variety to a writer's language, allowing for clearer and more effective communication of ideas and concepts.