stock purchase plan vs plan

stock purchase plan and plan both are nouns.

Word	Noun	Adjective	Verb	Adverb
stock purchase plan	Yes	No	No	No
plan	Yes	No	Yes	No

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

stock purchase plan: an organized plan for employees of a company to buy shares of its stock
plan: a series of steps to be carried out or goals to be accomplished

Other hypernyms of stock purchase plan include program, programme.

stock purchase plan (noun)	plan (noun)
an organized plan for employees of a company to buy shares of its stock	scale drawing of a structure
	a series of steps to be carried out or goals to be accomplished
	an arrangement scheme

stock purchase 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