diametrical opposition vs antipodal

diametrical opposition and antipodal both are nouns.

Word	Noun	Adjective	Verb	Adverb
diametrical opposition	Yes	No	No	No
antipodal	Yes	Yes	No	No

As nouns, diametrical opposition and antipodal are synonyms defined as:

diametrical opposition and antipodal: the relation of opposition along a diameter

Other synonyms of diametrical opposition include antipodal opposition.

diametrical opposition (noun)	antipodal (noun)
the relation of opposition along a diameter	the relation of opposition along a diameter

diametrical opposition (adjective)	antipodal (adjective)
	relating to the antipodes or situated at opposite sides of the earth