retirement plan vs plan

retirement plan and plan both are nouns.

Word	Noun	Adjective	Verb	Adverb
retirement plan	Yes	No	No	No
plan	Yes	No	Yes	No

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

retirement plan: a plan for setting aside money to be spent after retirement
plan: a series of steps to be carried out or goals to be accomplished

Other hypernyms of retirement plan include program, programme.

retirement plan (noun)	plan (noun)
a plan for setting aside money to be spent after retirement	scale drawing of a structure
	a series of steps to be carried out or goals to be accomplished
	an arrangement scheme

retirement plan (verb)	plan (verb)
	make plans for something
	have the will and intention to carry out some action
	make or work out a plan for; devise