sum of money vs sum

sum of money and sum both are nouns.

Word	Noun	Adjective	Verb	Adverb
sum of money	Yes	No	No	No
sum	Yes	No	Yes	No

As nouns, sum of money and sum are synonyms defined as:

Other synonyms of sum of money include amount, amount of money.

sum of money (noun)	sum (noun)
a quantity of money	the whole amount
	the choicest or most essential or most vital part of some idea or experience
	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

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