totality vs sum

totality and sum both are nouns.

Word	Noun	Adjective	Verb	Adverb
totality	Yes	No	No	No
sum	Yes	No	Yes	No

As nouns, totality and sum are synonyms defined as:

Other synonyms of totality include aggregate, total.

totality (noun)	sum (noun)
the whole amount	the whole amount
the quality of being complete and indiscriminate	the choicest or most essential or most vital part of some idea or experience
the state of being total and complete	a quantity obtained by the addition of a group of numbers
	the final aggregate
	a set containing all and only the members of two or more given sets
	a quantity of money

totality (verb)	sum (verb)
	determine the sum of
	be a summary of