leading man vs histrion

leading man and histrion both are nouns.

Word	Noun	Adjective	Verb	Adverb
leading man	Yes	No	No	No
histrion	Yes	No	No	No

As nouns, histrion is a hypernym of leading man; that is, histrion is a word with a broader meaning than leading man:

Other hypernyms of leading man include actor, player, role player, thespian, adult male, man.

leading man (noun)	histrion (noun)
actor who plays the leading male role	a theatrical performer