sum vs revenue

sum and revenue both are nouns.

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

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

sum (noun)	revenue (noun)
the whole amount	the entire amount of income before any deductions are made
the choicest or most essential or most vital part of some idea or experience	government income due to taxation
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)	revenue (verb)
determine the sum of
be a summary of