blastoff vs rocket firing

blastoff and rocket firing both are nouns.

Word	Noun	Adjective	Verb	Adverb
blastoff	Yes	No	No	No
rocket firing	Yes	No	No	No

As nouns, rocket firing is a hypernym of blastoff; that is, rocket firing is a word with a broader meaning than blastoff:

blastoff: the launching of a missile or spacecraft to a specified destination
rocket firing: the launching of a rocket or missile under its own power

Other hypernyms of blastoff include rocket launching.

blastoff (noun)	rocket firing (noun)
the launching of a missile or spacecraft to a specified destination	the launching of a rocket or missile under its own power