rely on vs depend upon

rely on and depend upon both are verbs.

Word	Noun	Adjective	Verb	Adverb
rely on	No	No	Yes	No
depend upon	No	No	Yes	No

As verbs, rely on and depend upon are synonyms defined as:

Other synonyms of rely on include depend on, rely upon.

rely on (verb)	depend upon (verb)
put trust in with confidence	be contingent on
be dependent on, as for support or maintenance	put trust in with confidence