meal plan vs plan

meal plan and plan both are nouns.

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

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

meal plan: a plan and a room rate for providing a room and meals to guests at a hotel
plan: an arrangement scheme

Other hypernyms of meal plan include design.

meal plan (noun)	plan (noun)
a plan and a room rate for providing a room and meals to guests at a hotel	scale drawing of a structure
	a series of steps to be carried out or goals to be accomplished
	an arrangement scheme

meal 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