contribution vs sum of money

contribution and sum of money both are nouns.

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

As nouns, sum of money is a hypernym of contribution; that is, sum of money is a word with a broader meaning than contribution:

Other hypernyms of contribution include amount, amount of money, sum.

contribution (noun)	sum of money (noun)
act of giving in common with others for a common purpose especially to a charity	a quantity of money
a writing for publication especially one of a collection of writings as an article or story
the effort contributed by a person in bringing about a result
a voluntary gift (as of money or service or ideas) made to some worthwhile cause
an amount of money contributed