build upon vs rest on

build upon and rest on both are verbs.

Word	Noun	Adjective	Verb	Adverb
build upon	No	No	Yes	No
rest on	No	No	Yes	No

As verbs, build upon and rest on are synonyms defined as:

Other synonyms of build upon include build on, repose on.

build upon (verb)	rest on (verb)
use as a basis for theories and claims	rest on for support
	use as a basis for theories and claims