tropics vs tropical zone

tropics and tropical zone both are nouns.

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

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

tropics and tropical zone: 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 tropics include Torrid Zone.

tropics (noun)	tropical zone (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