defer vs set back

defer and set back both are verbs.

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

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

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

defer (verb)	set back (verb)
yield to another's wish or opinion	slow down the progress of; hinder
hold back to a later time	cost a certain amount
	hold back to a later time