propulsion vs launching

propulsion and launching both are nouns.

Word	Noun	Adjective	Verb	Adverb
propulsion	Yes	No	No	No
launching	Yes	No	No	No

As nouns, launching is a hyponym of propulsion; that is, launching is a word with a more specific, narrower meaning than propulsion:

propulsion (noun)	launching (noun)
the act of propelling	the act of propelling with force
a propelling force	the act of beginning something new
	the act of moving a newly built vessel into the water for the first time