tropical zone vs tropics

tropical zone and tropics both are nouns.

Word	Noun	Adjective	Verb	Adverb
tropical zone	Yes	No	No	No
tropics	Yes	No	No	No

As nouns, tropical zone and tropics are synonyms defined as:

tropical zone and tropics: the part of the Earth's surface between the Tropic of Cancer and the Tropic of Capricorn; characterized by a hot climate

Other synonyms of tropical zone include Torrid Zone.

tropical zone (noun)	tropics (noun)
the part of the Earth's surface between the Tropic of Cancer and the Tropic of Capricorn; characterized by a hot climate	the part of the Earth's surface between the Tropic of Cancer and the Tropic of Capricorn; characterized by a hot climate