politics vs political science

politics and political science both are nouns.

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

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

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

Other synonyms of politics include government.

politics (noun)	political science (noun)
the profession devoted to governing and to political affairs	the study of government of states and other political units
the activities and affairs involved in managing a state or a government
the study of government of states and other political units
the opinion you hold with respect to political questions
social relations involving intrigue to gain authority or power