policy vs plan of action

policy and plan of action both are nouns.

Word	Noun	Adjective	Verb	Adverb
policy	Yes	No	No	No
plan of action	Yes	No	No	No

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

policy (noun)	plan of action (noun)
a plan of action adopted by an individual or social group	a plan for actively doing something
a line of argument rationalizing the course of action of a government
written contract or certificate of insurance