sum vs collection

sum and collection both are nouns.

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

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

Other hypernyms of sum include accumulation, aggregation, assemblage.

sum (noun)	collection (noun)
the whole amount	the act of gathering something together
the choicest or most essential or most vital part of some idea or experience	a publication containing a variety of works
a quantity obtained by the addition of a group of numbers	request for a sum of money
the final aggregate	several things grouped together or considered as a whole
a set containing all and only the members of two or more given sets
a quantity of money

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