polar vs equatorial

polar is not a noun while equatorial is a noun.

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

polar (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

polar (adjective)	equatorial (adjective)
of or existing at or near a geographical pole or within the Arctic or Antarctic Circles	of or existing at or near the geographic equator
located at or near or coming from the earth's poles	of or relating to conditions at the geographical equator
having a pair of equal and opposite charges	of or relating to or at an equator
extremely cold
being of crucial importance
characterized by opposite extremes; completely opposed