polar zone vs climatic zone

polar zone and climatic zone both are nouns.

Word	Noun	Adjective	Verb	Adverb
polar zone	Yes	No	No	No
climatic zone	Yes	No	No	No

As nouns, climatic zone is a hypernym of polar zone; that is, climatic zone is a word with a broader meaning than polar zone:

polar zone: the part of the Earth's surface forming a cap over a pole; characterized by frigid climate
climatic zone: any of the geographical zones loosely divided according to prevailing climate and latitude

polar zone (noun)	climatic zone (noun)
the part of the Earth's surface forming a cap over a pole; characterized by frigid climate	any of the geographical zones loosely divided according to prevailing climate and latitude