launch vs commence

launch is a noun but commence is not a noun.

Word	Noun	Adjective	Verb	Adverb
launch	Yes	No	Yes	No
commence	No	No	Yes	No

As verbs, commence is a hypernym of launch; that is, commence is a word with a broader meaning than launch:

Other hypernyms of launch include begin, get, get down, set about, set out, start, start out.

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

launch (verb)	commence (verb)
begin with vigor	take the first step or steps in carrying out an action
propel with force	set in motion, cause to start
launch for the first time; launch on a maiden voyage	get off the ground
get going; give impetus to
smoothen the surface of
set up or found