sex object vs actor

sex object and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
sex object	Yes	No	No	No
actor	Yes	No	No	No

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

Other hypernyms of sex object include doer, worker.

sex object (noun)	actor (noun)
any person regarded simply as an object of sexual gratification	a theatrical performer
	a person who acts and gets things done