equatorial vs tropical

equatorial is a noun but tropical is not a noun.

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

equatorial (noun)	tropical (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

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