launch vs blast off

launch is a noun but blast off is not a noun.

Word	Noun	Adjective	Verb	Adverb
launch	Yes	No	Yes	No
blast off	No	No	Yes	No

As verbs, blast off is a hyponym of launch; that is, blast off is a word with a more specific, narrower meaning than launch:

Other hyponyms of launch include float.

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

launch (verb)	blast off (verb)
begin with vigor	launch with great force
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