111 entries under core topic. ×

34
heart(noun, support, action, place, part)
30
focus(noun, center, centre, place, quick)
23
pith(noun, place, quality, body, cause)
22
essence(noun, support, action, place, cause)
19
hub(noun, support, place, point, emotion)
18
kernel(noun, place, quality, body, start)
16
nub(noun, quality, body, cause, start)
15
gist(noun, place, body, substance, idea)
13
meat(noun, quality, body, character, spirit)
13
marrow(noun, place, quality, cause, start)
12
pivot(noun, support, place, body, point)
11
crux(noun, support, action, quality, body)
11
middle(noun, place, body, substance, emotion)
11
center(noun, support, action, place, body)
10
germ(noun, quality, cause, start, character)
10
substance(noun, quality, body, cause, start)
8
midst(noun, center, middle, target)
8
root(noun, support, action, place, quality)
7
embryo(noun, cause, start, influence, base)
7
principle(noun, support, action, quality, cause)
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APASmart Define. (2015). nucleus thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/nucleus/thesaurus/synonyms
ChicagoSmart Define. 2015. "nucleus thesaurus" https://smartdefine.org/nucleus/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, nucleus thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/nucleus/thesaurus/synonyms>.
MLASmart Define. "nucleus thesaurus" 24 December 2015. Web. 23 September 2026. <https://smartdefine.org/nucleus/thesaurus/synonyms>