fireball vs actor

fireball and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
fireball	Yes	No	No	No
actor	Yes	No	No	No

As nouns, actor is a hypernym of fireball; that is, actor is a word with a broader meaning than fireball:

Other hypernyms of fireball include doer, worker.

fireball (noun)	actor (noun)
the luminous center of a nuclear explosion	a theatrical performer
a ball of fire (such as the sun or a ball-shaped discharge of lightning)	a person who acts and gets things done
a highly energetic and indefatigable person
an especially luminous meteor (sometimes exploding)