147 entries under essential topic. ×

8
needed(adjective, important, significant, critical)
7
needful(adjective, set, important, significant, capital)
7
vital(adjective, set, right, important, significant)
5
called for(verb, expression, adjective, phrasal verb)
5
desideratum(noun, want, need, certainty)
5
wanted(adjective, important, significant, capital)
4
basic(noun, adjective, important, want, significant)
4
expedient(adjective, significant, basic, vital)
4
fundamental(noun, adjective, important, need, significant)
4
important(adjective, critical, vital, fundamental)
4
necessitous(adjective, important, capital, vital)
4
want(noun, need, certainty, basic)
3
arrangement(noun, condition, requirement, qualification)
3
compulsory(adjective, set, significant, basic)
3
fine print(expression, idiom, condition, requirement)
3
terms(noun, condition, requirement, qualification)
2
binding(adjective, significant, basic, vital)
2
compulsion(noun, want, need, certainty)
2
contingency(noun, form, fix, pass, position)
2
exception(condition, requirement, qualification)
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APASmart Define. (2015). prerequisite thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/prerequisite/thesaurus/synonyms
ChicagoSmart Define. 2015. "prerequisite thesaurus" https://smartdefine.org/prerequisite/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, prerequisite thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/prerequisite/thesaurus/synonyms>.
MLASmart Define. "prerequisite thesaurus" 4 September 2015. Web. 23 September 2026. <https://smartdefine.org/prerequisite/thesaurus/synonyms>