ramp up vs build

ramp up is not a noun while build is a noun.

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

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

Other synonyms of ramp up include build up, work up.

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

ramp up (verb)	build (verb)
bolster or strengthen	form or accumulate steadily
	improve the cleansing action of
	bolster or strengthen
	develop and grow
	found or ground
	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