first appearance vs launching

first appearance and launching both are nouns.

Word	Noun	Adjective	Verb	Adverb
first appearance	Yes	No	No	No
launching	Yes	No	No	No

As nouns, first appearance and launching are synonyms defined as:

Other synonyms of first appearance include debut, entry, introduction, unveiling.

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