plan vs floor plan

plan and floor plan both are nouns.

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

As nouns, floor plan is a hyponym of plan; that is, floor plan is a word with a more specific, narrower meaning than plan:

plan: scale drawing of a structure
floor plan: scale drawing of a horizontal section through a building at a given level; contrasts with elevation

Other hyponyms of plan include elevation.

plan (noun)	floor plan (noun)
scale drawing of a structure	scale drawing of a horizontal section through a building at a given level; contrasts with elevation
a series of steps to be carried out or goals to be accomplished
an arrangement scheme

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