turn on vs build upon

turn on and build upon both are verbs.

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

As verbs, build upon is a hyponym of turn on; that is, build upon is a word with a more specific, narrower meaning than turn on:

Other hyponyms of turn on include build on, repose on, rest on.

turn on (verb)	build upon (verb)
become hostile towards	use as a basis for theories and claims
get high, stoned, or drugged
cause to operate by flipping a switch
to evoke sexual feelings
cause to be agitated, excited, or roused
produce suddenly or automatically
be contingent on