sum vs tot

sum and tot both are nouns.

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

As verbs, sum and tot are synonyms defined as:

Other synonyms of sum include add, add together, add up, sum up, summate, tally, tot up, total, tote up.

sum (noun)	tot (noun)
the whole amount	a young child who is just beginning to walk
the choicest or most essential or most vital part of some idea or experience	a small amount (especially of a drink)
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)	tot (verb)
determine the sum of	determine the sum of
be a summary of