polar vs diametrical

polar and diametrical both are adjectives.

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

As adjectives, polar and diametrical are synonyms defined as:

polar and diametrical: characterized by opposite extremes; completely opposed

Other synonyms of polar include diametric, opposite.

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