2
built-in(adjective, intrinsic)
2
centermost(noun, mean, middle, internal, halfway)
2
centroidal(adjective, main, middle, principal)
2
close(adjective, near, accessible, handy, immediate)
2
component(adjective, intrinsic)
2
concentrated
2
controlling(adjective, head, essential, core, key)
2
convergent(adjective, focal)
2
flat
2
general(adjective, lead, head, master, boss)
2
genetic
2
great(significant, vital, imperative)
2
head(adjective, lead, master, boss)
2
heavy(important, significant, vital, fundamental, imperative)
2
imperative(adjective, important, significant, critical, vital)
2
in the middle(expression, idiom)
2
intermediary
2
life-and-death
2
life-or-death
2
material(significant, essential, basic, vital, imperative)
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APASmart Define. (2015). central thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/central/thesaurus/synonyms
ChicagoSmart Define. 2015. "central thesaurus" https://smartdefine.org/central/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, central thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/central/thesaurus/synonyms>.
MLASmart Define. "central thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/central/thesaurus/synonyms>