95 entries under noun topic. ×

6
attenuation
3
aggrandizement
3
expansion(expansion, rarity)
3
inflation(expansion, rarity)
2
vacuum(void, emptiness)
2
amplification
2
augmentation
2
development
2
dilatation
2
dilation
2
enlargement
2
extension
2
growth
2
increase
2
increment
2
rareness
2
rarity
1
ablution(refinement, distillation, freeing, cleansing)
1
absolution(refinement, distillation, freeing, cleansing)
1
acetylene
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APASmart Define. (2015). rarefaction thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/rarefaction/thesaurus/synonyms
ChicagoSmart Define. 2015. "rarefaction thesaurus" https://smartdefine.org/rarefaction/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, rarefaction thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/rarefaction/thesaurus/synonyms>.
MLASmart Define. "rarefaction thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/rarefaction/thesaurus/synonyms>