build up vs work up

build up and work up both are verbs.

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

As verbs, build up and work up are synonyms defined as:

Other synonyms of build up include build, progress.

As verbs, build up and work up are synonyms defined as:

Other synonyms of build up include build, ramp up.

build up (verb)	work up (verb)
form or accumulate steadily	develop
enlarge, develop, or increase by degrees or in stages	form or accumulate steadily
change the use of and make available or usable	come up with
bolster or strengthen	bolster or strengthen
prepare oneself for a military confrontation