set in motion vs launch

set in motion is not a noun while launch is a noun.

Word	Noun	Adjective	Verb	Adverb
set in motion	No	No	Yes	No
launch	Yes	No	Yes	No

As verbs, set in motion and launch are synonyms defined as:

As verbs, launch is a hyponym of set in motion; that is, launch is a word with a more specific, narrower meaning than set in motion:

set in motion (noun)	launch (noun)
	the act of propelling with force
	a motorboat with an open deck or a half deck

set in motion (verb)	launch (verb)
get going; give impetus to	begin with vigor
	propel with force
	launch for the first time; launch on a maiden voyage
	get going; give impetus to
	smoothen the surface of
	set up or found