think up vs make up

think up and make up both are verbs.

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

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

Other hyponyms of think up include idealise, idealize, cook up, fabricate, invent, manufacture.

think up (verb)	make up (verb)
devise or invent	apply make-up or cosmetics to one's face to appear prettier
	put in order or neaten
	come to terms
	concoct something artificial or untrue
	devise or compose
	do or give something to somebody in return
	make up work that was missed due to absence at a later point
	form or compose
	adjust for