The word "presupremacy" is spelled with a "pre" prefix followed by the word "supremacy". The IPA phonetic transcription for "pre" is /priː/ and for "supremacy" it is /suːˈprɛməsi/. Therefore, the spelling of "presupremacy" follows the standard English spelling rule of prefixing a word with "pre" to indicate something that comes before, and adding it to another word to create a new meaning. The word "presupremacy" denotes something that is assumed to be superior or dominant, even before it is established.