Yes, sums is a Scrabble word!

Verb

1. Be a summary of

2. Determine the sum of

Noun

1. A quantity of money

2. A quantity obtained by the addition of a group of numbers

3. The final aggregate

4. The choicest or most essential or most vital part of some idea or experience

5. The whole amount

6. A set containing all and only the members of two or more given sets