build up vs amend

build up and amend both are verbs.

Word	Noun	Adjective	Verb	Adverb
build up	No	No	Yes	No
amend	No	No	Yes	No

As verbs, amend is a hypernym of build up; that is, amend is a word with a broader meaning than build up:

Other hypernyms of build up include ameliorate, better, improve, meliorate.

build up (verb)	amend (verb)
form or accumulate steadily	to make better
enlarge, develop, or increase by degrees or in stages	set straight or right
change the use of and make available or usable	make amendments to
bolster or strengthen
prepare oneself for a military confrontation