add up vs average out

add up and average out both are verbs.

Word	Noun	Adjective	Verb	Adverb
add up	No	No	Yes	No
average out	No	No	Yes	No

As verbs, average out is a hyponym of add up; that is, average out is a word with a more specific, narrower meaning than add up:

Other hyponyms of add up include work out, outnumber, average, make.

add up (verb)	average out (verb)
determine the sum of	compute the average of
be reasonable or logical or comprehensible	amount to or come to an average, without loss or gain
to measure up to in kind or quality
add up in number or quantity