The antonyms for the word 'sub alternate' include primary, superior, main, chief, major, higher, dominant, and senior. The word 'sub alternate' refers to a secondary or lower position or rank, and its antonyms express a higher or more important position or rank. For instance, a primary school teacher holds a superior position compared to a sub-alternate teacher. A company's CEO holds a dominant position, while a sub-alternate employee holds a lower position. Using antonyms of 'sub-alternate' can help to express the significance and importance of a particular position or rank.