ugly duckling vs actor

ugly duckling and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
ugly duckling	Yes	No	No	No
actor	Yes	No	No	No

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

ugly duckling: an ugly or unpromising child who grows into a beautiful or worthy person
actor: a person who acts and gets things done

Other hypernyms of ugly duckling include doer, worker.

ugly duckling (noun)	actor (noun)
an ugly or unpromising child who grows into a beautiful or worthy person	a theatrical performer
	a person who acts and gets things done