attempt vs set about

attempt is a noun but set about is not a noun.

Word	Noun	Adjective	Verb	Adverb
attempt	Yes	No	Yes	No
set about	No	No	Yes	No

As verbs, attempt and set about are synonyms defined as:

Other synonyms of attempt include undertake.

attempt (noun)	set about (noun)
earnest and conscientious activity intended to do or accomplish something
the act of attacking

attempt (verb)	set about (verb)
enter upon an activity or enterprise	take the first step or steps in carrying out an action
make an effort or attempt	enter upon an activity or enterprise
	begin to deal with