Synonyms of duality
dichotomyIf there is a dichotomy between two things, there is a very great difference or opposition between them.
• a dichotomy between the academic world and the industrial world
polarityIf there is a polarity between two people or things, they are completely different from each other in some way.
• the polarities of good and evil
Thesaurus for duality from the Collins English Thesaurus