Antarctic Peninsula vs Palmer Peninsula

Antarctic Peninsula and Palmer Peninsula both are nouns.

Word	Noun	Adjective	Verb	Adverb
Antarctic Peninsula	Yes	No	No	No
Palmer Peninsula	Yes	No	No	No

As nouns, Antarctic Peninsula and Palmer Peninsula are synonyms defined as:

Antarctic Peninsula and Palmer Peninsula: a large peninsula of Antarctica that extends some 1200 miles north toward South America; separates the Weddell Sea from the South Pacific

Antarctic Peninsula (noun)	Palmer Peninsula (noun)
a large peninsula of Antarctica that extends some 1200 miles north toward South America; separates the Weddell Sea from the South Pacific	a large peninsula of Antarctica that extends some 1200 miles north toward South America; separates the Weddell Sea from the South Pacific