The prefix "contra-" is commonly used to express opposition or negation. There are many synonyms for this prefix, including "anti-", "counter", "opposed to", "against", "opposite", and "reverse". These words can be used to modify a variety of root words, and are commonly found in political and social contexts. For example, "anti-establishment" refers to opposition against established institutions, while "counterargument" represents an argument made in opposition to another argument. Understanding the nuances of these different synonyms for "contra-" can help you communicate more effectively in a variety of settings, and can help you better understand complex topics and ideas.