sum vs cash advance

sum and cash advance both are nouns.

Word	Noun	Adjective	Verb	Adverb
sum	Yes	No	Yes	No
cash advance	Yes	No	No	No

As nouns, cash advance is a hyponym of sum; that is, cash advance is a word with a more specific, narrower meaning than sum:

sum (noun)	cash advance (noun)
the whole amount	an amount paid before it is earned
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)	cash advance (verb)
determine the sum of
be a summary of