political science vs combination

political science and combination both are nouns.

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

political science (noun)	combination (noun)
the study of government of states and other political units	the act of combining things to form a new whole
	the act of arranging elements into specified groups without regard to order
	a collection of things that have been combined; an assemblage of separate parts or qualities
	a group of people (often temporary) having a common purpose
	a sequence of numbers or letters that opens a combination lock
	an alliance of people or corporations or countries for a special purpose (formerly to achieve some antisocial end but now for general political or economic purposes)
	a coordinated sequence of chess moves