political relation vs politics

political relation and politics both are nouns.

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

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

political relation and politics: social relations involving intrigue to gain authority or power

political relation (noun)	politics (noun)
social relations involving intrigue to gain authority or power	the profession devoted to governing and to political affairs
	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