build vs build up

build is a noun but build up is not a noun.

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

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

Other synonyms of build include progress, work up.

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

Other synonyms of build include ramp up, work up.

build (noun)	build up (noun)
constitution of the human body
alternative names for the body of a human being

build (verb)	build up (verb)
form or accumulate steadily	form or accumulate steadily
improve the cleansing action of	enlarge, develop, or increase by degrees or in stages
bolster or strengthen	change the use of and make available or usable
develop and grow	bolster or strengthen
found or ground	prepare oneself for a military confrontation
make by combining materials and parts
give form to, according to a plan
build or establish something abstract
be engaged in building
order, supervise, or finance the construction of