antipodal opposition vs diametrical opposition

antipodal opposition and diametrical opposition both are nouns.

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

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

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

Other synonyms of antipodal opposition include antipodal.

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