extra vs histrion

extra and histrion both are nouns.

Word	Noun	Adjective	Verb	Adverb
extra	Yes	Yes	No	Yes
histrion	Yes	No	No	No

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

Other hypernyms of extra include actor, player, role player, thespian.

extra (noun)	histrion (noun)
something additional of the same kind	a theatrical performer
an additional edition of a newspaper (usually to report a crisis)
a minor actor in crowd scenes

extra (adjective)	histrion (adjective)
further or added
more than is needed, desired, or required
added to a regular schedule

extra (adverb)	histrion (adverb)
unusually or exceptionally