Synonyms of 'dichotomy'
divisionDictionary, gulf, splita dichotomy between the academic world and the industrial world
Dichotomy should always refer to a division of some kind into two groups. It is sometimes used to refer to a puzzling situation, which seems to involve a contradiction, but this use is thought by many to be incorrect, and dilemma is a more appropriate alternative.
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A gulf is an important or significant difference between two people, things, or groups.
the gulf between rural and urban life
If 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 dichotomy from the Collins English Thesaurus
If there is a dichotomy between two things, there is a very great difference or opposition between them.