junior vs actor

junior and actor both are nouns.

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

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

Other hypernyms of junior include doer, worker.

junior (noun)	actor (noun)
the younger of two persons	a theatrical performer
a third-year undergraduate	a person who acts and gets things done
term of address for a disrespectful and annoying male

junior (adjective)	actor (adjective)
younger; lower in rank; shorter in length of tenure or service
used of the third or next to final year in United States high school or college
including or intended for youthful persons