political science vs government

political science and government both are nouns.

Word	Noun	Adjective	Verb	Adverb
political science	Yes	No	No	No
government	Yes	No	No	No

As nouns, political science and government are synonyms defined as:

political science and government: the study of government of states and other political units

Other synonyms of political science include politics.

political science (noun)	government (noun)
the study of government of states and other political units	the act of governing; exercising authority
	(government) the system or form by which a community or other political unit is governed
	the study of government of states and other political units
	the organization that is the governing authority of a political unit