build up vs redevelop

build up and redevelop both are verbs.

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

As verbs, redevelop is a hyponym of build up; that is, redevelop is a word with a more specific, narrower meaning than build up:

Other hyponyms of build up include settle.

build up (verb)	redevelop (verb)
form or accumulate steadily	change the plans for the use of (land)
enlarge, develop, or increase by degrees or in stages	formulate or develop again, of an improved theory or hypothesis
change the use of and make available or usable	develop for a second time, in order to improve the contrast, colour, etc., of a negative or print
bolster or strengthen
prepare oneself for a military confrontation