32 entries under simple topic. ×

2
basal(adjective, plain, important, significant)
2
basic(adjective, plain, important, significant)
2
elemental(adjective, plain, important, significant)
2
elementary(adjective, plain, important, significant)
2
essential(adjective, plain, important, significant)
2
foundational(adjective, plain, important, significant)
2
fundamental(adjective, clear, plain, important)
2
original(adjective, plain, important, significant)
2
primitive(adjective, plain, important, significant)
2
rudimentary(adjective, plain, important, significant)
2
underlying(adjective, plain, important, significant)
1
primary(adjective, plain, important, significant)
1
ABCs(adjective, straightforward, basic, fundamental)
1
abecedarian(adjective, straightforward, basic, fundamental)
1
beginning(adjective, straightforward, basic, fundamental)
1
clear(adjective, straightforward, basic, fundamental)
1
duck soup(expression, adjective, straightforward, basic)
1
easy(adjective, straightforward, basic, fundamental)
1
facile(adjective, straightforward, basic, fundamental)
1
initial(adjective, straightforward, basic, fundamental)
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APASmart Define. (2011). substratal thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/substratal/thesaurus/synonyms
ChicagoSmart Define. 2011. "substratal thesaurus" https://smartdefine.org/substratal/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2011, substratal thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/substratal/thesaurus/synonyms>.
MLASmart Define. "substratal thesaurus" 24 May 2011. Web. 20 September 2026. <https://smartdefine.org/substratal/thesaurus/synonyms>