Synonyms for Tropic (same or very similar meaning)
WordNet sense 1 (relating to or situated in or characteristic of the tropics (the region on either side of the equator)):
tropicalWordNet sense 2 (of or existing at or near the geographic equator):
equatorialWordNet sense 3 (used of physical heat; having a high or higher than desirable temperature or giving off heat or feeling or causing a sensation of heat or burning):
hotFrom the ODE community, based on WordNetadd/edit