SUPPLEMENTARY Synonyms: 64 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/supplementary
WebSynonyms for SUPPLEMENTARY: auxiliary, additional, supplemental, accessory, peripheral, makeshift, accessorial, appurtenant; Antonyms of SUPPLEMENTARY: main, principal, chief, basic, primary, fundamental, necessary, prime
DA: 72 PA: 12 MOZ Rank: 3 Up or Down: Up