Superpower - A superpower is a state with a dominant position in the international system which has the ability to influence events and its own interests and project power on a worldwide scale to protect those interests. A superpower is traditionally considered to be a step higher than a great power.
Greatpower - A great power is a state that is recognized as having the ability to exert its influence on a global scale. Great powers characteristically possess military and economic strength and diplomatic and soft power influence which may cause small powers to consider the opinions of great powers before taking actions of their own. International relations theorists have posited that great power status can be characterized into power capabilities, spatial aspects, and status dimensions.
China falls in 2nd category alongside JAPAN, GERMANY, FRANCE, RUSSIA, UNITED KINGDOM.
Or in other words G8.
India is a world power by it's sheer size in economy and military but can only influence regional and nearby geostrategic matters.
India is widely regarded as an emerging power and possibly a potential superpower; some academics, such as Dr. Zbigniew Brzezinski, regard it as having now achieved great power status.