Antarctic continent vs South Frigid Zone

Antarctic continent and South Frigid Zone both are nouns.

Word	Noun	Adjective	Verb	Adverb
Antarctic continent	Yes	No	No	No
South Frigid Zone	Yes	No	No	No

Antarctic continent (noun)	South Frigid Zone (noun)
an extremely cold continent at the south pole almost entirely below the Antarctic Circle; covered by an ice cap up to 13,000 feet deep	the region around the south pole: Antarctica and surrounding waters