delay vs set back

delay is a noun but set back is not a noun.

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

As verbs, set back is a hyponym of delay; that is, set back is a word with a more specific, narrower meaning than delay:

delay (noun)	set back (noun)
the act of delaying; inactivity resulting in something being put off until a later time
time during which some action is awaited

delay (verb)	set back (verb)
cause to be slowed down or delayed	slow down the progress of; hinder
stop or halt	cost a certain amount
slow the growth or development of	hold back to a later time
act later than planned, scheduled, or required