outline vs sum-up

outline and sum-up both are nouns.

Word	Noun	Adjective	Verb	Adverb
outline	Yes	No	Yes	No
sum-up	Yes	No	No	No

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

Other hypernyms of outline include summary.

outline (noun)	sum-up (noun)
a schematic or preliminary plan	a brief statement that presents the main points in a concise form
a sketchy summary of the main points of an argument or theory
the line that appears to bound an object

outline (verb)	sum-up (verb)
describe roughly or briefly or give the main points or summary of
trace the shape of
draw up an outline or sketch for something