Antimonopolist refers to a person or group that opposes or works against monopolies. Some synonyms for antimonopolist include monopoly opponent, antitrust advocate, competitor, rival, and market challenger. These terms describe individuals or entities that actively promote fair competition and oppose any business practices that hinder it. Other synonyms include free-market proponent, price regulator, and trustbuster. These terms are often associated with those who advocate for government intervention to prevent monopolistic practices or to break up existing monopolies. Overall, the use of these synonyms reflects the importance of promoting competition in a healthy market economy.