blast off vs launch

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

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

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

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

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