sum up vs total

sum up is not a noun while total is a noun.

Word	Noun	Adjective	Verb	Adverb
sum up	No	No	Yes	No
total	Yes	Yes	Yes	No

As verbs, sum up and total are synonyms defined as:

Other synonyms of sum up include add, add together, add up, sum, summate, tally, tot, tot up, tote up.

sum up (noun)	total (noun)
	the whole amount
	a quantity obtained by the addition of a group of numbers

sum up (adjective)	total (adjective)
	constituting the full quantity or extent; complete
	complete in extent or degree and in every particular

sum up (verb)	total (verb)
give a summary (of)	damage beyond the point of repair
determine the sum of	determine the sum of
be a summary of	add up in number or quantity