set back vs put off

set back and put off both are verbs.

Word	Noun	Adjective	Verb	Adverb
set back	No	No	Yes	No
put off	No	No	Yes	No

As verbs, set back and put off are synonyms defined as:

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

set back (verb)	put off (verb)
slow down the progress of; hinder	avoid or try to avoid fulfilling, answering, or performing (duties, questions, or issues)
cost a certain amount	take away the enthusiasm of
hold back to a later time	cause to feel embarrassment
	cause to feel intense dislike or distaste
	hold back to a later time