Is “Sum” a Scrabble word?
Yes
SUM
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Sum
/sʌm/
noun
1.A quantity obtained by addition or aggregation.
“The sum of 3 and 4 is 7.”
2.(often plural) An arithmetic computation, especially one posed to a student as an exercise (not necessarily limited to addition).
“We're learning about division, and the sums are tricky.”
3.A quantity of money.
“a tidy sum”
Synonyms: calculation, computation, center, centre, core, essence
verb
1.To add together.
2.To give a summary of.
Synonyms: add, add together, add up, sum up, summate, tally