Mikhail Sergeyevich Gorbachev is most commonly known as the last leader of the Soviet Union, under whose government the country underwent significant political and social reforms. However, there are several synonyms that can be used to refer to Gorbachev such as a politician, statesman, and diplomat. He was also known as a reformer, innovator, and visionary who ushered in a new era in Soviet history. In addition, he is often called the "father of perestroika" and "glasnost" as both programs brought about significant changes in the Soviet political and economic system. Overall, Gorbachev will always be remembered as a significant figure in history who played a crucial role in reshaping the world.