postpone vs set back

postpone and set back both are verbs.

Word	Noun	Adjective	Verb	Adverb
postpone	No	No	Yes	No
set back	No	No	Yes	No

As verbs, postpone and set back are synonyms defined as:

Other synonyms of postpone include defer, hold over, prorogue, put off, put over, remit, shelve, table.

postpone (verb)	set back (verb)
hold back to a later time	slow down the progress of; hinder
	cost a certain amount
	hold back to a later time