centralism vs policy

centralism and policy both are nouns.

Word	Noun	Adjective	Verb	Adverb
centralism	Yes	No	No	No
policy	Yes	No	No	No

As nouns, policy is a hypernym of centralism; that is, policy is a word with a broader meaning than centralism:

centralism: the political policy of concentrating power in a central organization
policy: a plan of action adopted by an individual or social group

centralism (noun)	policy (noun)
the political policy of concentrating power in a central organization	a plan of action adopted by an individual or social group
	a line of argument rationalizing the course of action of a government
	written contract or certificate of insurance