outline vs plan

outline and plan both are nouns.

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

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

Other hypernyms of outline include program, programme.

outline (noun)	plan (noun)
a schematic or preliminary plan	scale drawing of a structure
a sketchy summary of the main points of an argument or theory	a series of steps to be carried out or goals to be accomplished
the line that appears to bound an object	an arrangement scheme

outline (verb)	plan (verb)
describe roughly or briefly or give the main points or summary of	make plans for something
trace the shape of	have the will and intention to carry out some action
draw up an outline or sketch for something	make or work out a plan for; devise