15 entries under necessary topic. ×

2
prerequisite(adjective, essential, obligatory, compulsory)
2
needful(essential, obligatory, compulsory, mandatory)
2
required(right, essential, obligatory, compulsory)
2
requisite(essential, obligatory, compulsory, mandatory)
2
vital(essential, obligatory, compulsory, mandatory)
1
essential(adjective, set, important, serious, critical)
1
indispensable(essential, obligatory, compulsory, mandatory)
0
basic
0
crucial(adjective, vital)
0
expedient
0
imperative(essential, obligatory, compulsory, mandatory)
0
mandatory(right, essential, obligatory, compulsory)
0
necessitous
0
obligatory(right, essential, compulsory, mandatory)
0
of the essence(expression, idiom, essential)
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APASmart Define. (2015). called for thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/called_for/thesaurus/synonyms
ChicagoSmart Define. 2015. "called for thesaurus" https://smartdefine.org/called_for/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, called for thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/called_for/thesaurus/synonyms>.
MLASmart Define. "called for thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/called_for/thesaurus/synonyms>