ESSENTIAL Synonyms: 191 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/essential
WebSynonyms for ESSENTIAL: necessary, required, integral, needed, needful, vital, critical, imperative; Antonyms of ESSENTIAL: unnecessary, needless, nonessential, unwanted, dispensable, unimportant, unessential, inessential
DA: 69 PA: 96 MOZ Rank: 59