sum vs amount of money

sum and amount of money both are nouns.

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

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

Other synonyms of sum include amount, sum of money.

sum (noun)	amount of money (noun)
the whole amount	a quantity of money
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 (verb)	amount of money (verb)
determine the sum of
be a summary of