cost vs set back

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

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

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

Other hyponyms of cost include knock back, put back.

cost (noun)	set back (noun)
the property of having material worth (often indicated by the amount of money something would bring if sold)
value measured by what must be given or done or undergone to obtain something
the total spent for goods or services including money and time and labor

cost (verb)	set back (verb)
be priced at	slow down the progress of; hinder
require to lose, suffer, or sacrifice	cost a certain amount
	hold back to a later time