add together vs calculate

add together and calculate both are verbs.

Word	Noun	Adjective	Verb	Adverb
add together	No	No	Yes	No
calculate	No	No	Yes	No

As verbs, calculate is a hypernym of add together; that is, calculate is a word with a broader meaning than add together:

Other hypernyms of add together include cipher, compute, cypher, figure, reckon, work out.

add together (verb)	calculate (verb)
make an addition by combining numbers	make a mathematical calculation or computation
determine the sum of	specifically design a product, event, or activity for a certain public
	judge to be probable
	have faith or confidence in
	predict in advance
	keep an account of