make up vs form

make up is not a noun while form is a noun.

Word	Noun	Adjective	Verb	Adverb
make up	No	No	Yes	No
form	Yes	No	Yes	No

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

Other hyponyms of make up include make, compose, constitute, make, range, straddle, fall into, fall under, pose, present, supplement.

make up (noun)	form (noun)
	the spatial arrangement of something as distinct from its substance
	a life-size dummy used to display clothes
	a mold for setting concrete
	the visual appearance of something or someone
	any spatial attributes (especially as defined by outline)
	an ability to perform well
	a particular mode in which something is manifested
	alternative names for the body of a human being
	a perceptual structure
	a category of things distinguished by some common characteristic or quality
	the phonological or orthographic sound or appearance of a word that can be used to describe or identify something
	a printed document with spaces in which to write
	an arrangement of the elements in a composition or discourse
	a body of students who are taught together
	(biology) a group of organisms within a species that differ in trivial ways from similar groups
	(physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary

make up (verb)	form (verb)
apply make-up or cosmetics to one's face to appear prettier	give shape or form to
put in order or neaten	assume a form or shape
come to terms	make something, usually for a specific function
concoct something artificial or untrue	create (as an entity)
devise or compose	establish or impress firmly in the mind
do or give something to somebody in return	to compose or represent
make up work that was missed due to absence at a later point	develop into a distinctive entity
form or compose
adjust for