Antarctica vs South Frigid Zone

Antarctica and South Frigid Zone both are nouns.

Word	Noun	Adjective	Verb	Adverb
Antarctica	Yes	No	No	No
South Frigid Zone	Yes	No	No	No

Antarctica (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