10 entries under compulsory topic. ×

2
prerequisite(adjective, essential, necessary, obligatory)
2
needful(essential, necessary, obligatory, mandatory)
2
required(right, essential, necessary, obligatory)
2
requisite(essential, necessary, obligatory, mandatory)
2
vital(essential, necessary, obligatory, mandatory)
1
indispensable(essential, necessary, obligatory, mandatory)
1
necessary(right, essential, obligatory, mandatory)
0
imperative(essential, necessary, obligatory, mandatory)
0
mandatory(right, essential, necessary, obligatory)
0
obligatory(right, essential, necessary, mandatory)
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APASmart Define. (2015). called for thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/called_for/thesaurus/synonyms
ChicagoSmart Define. 2015. "called for thesaurus" https://smartdefine.org/called_for/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, called for thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/called_for/thesaurus/synonyms>.
MLASmart Define. "called for thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/called_for/thesaurus/synonyms>