tropical vs equatorial

tropical is not a noun while equatorial is a noun.

Word	Noun	Adjective	Verb	Adverb
tropical	No	Yes	No	No
equatorial	Yes	Yes	No	No

tropical (noun)	equatorial (noun)
	a telescope whose mounting has only two axes of motion, one parallel to the Earth's axis and the other one at right angles to it

tropical (adjective)	equatorial (adjective)
of or relating to the tropics, or either tropic	of or existing at or near the geographic equator
relating to or situated in or characteristic of the tropics (the region on either side of the equator)	of or relating to conditions at the geographical equator
characterized by or of the nature of a trope or tropes; changed from its literal sense	of or relating to or at an equator
of weather or climate; hot and humid as in the tropics