| expiation(noun, refinement, distillation, freeing, cleansing) | |
| expurgation(noun, refinement, distillation, freeing, cleansing) | |
| forgiveness(noun, refinement, distillation, freeing, cleansing) | |
| freeing(noun, refinement, distillation, cleansing, sanitization) | |
| fume(noun, gas) | |
| gas(noun, gas) | |
| grace(noun, refinement, distillation, freeing, cleansing) | |
| helium(noun, gas) | |
| hydrocephalus | |
| hydrogen(noun, gas) | |
| lavation(noun, refinement, distillation, freeing, cleansing) | |
| laving(noun, refinement, distillation, freeing, cleansing) | |
| lustration(noun, refinement, purification, distillation, freeing) | |
| methane(noun, gas) | |
| miasma(noun, gas) | |
| neon(noun, gas) | |
| nitrogen(noun, gas) | |
| obesity | |
| oxygen(noun, gas) | |
| ozone(noun, gas) |
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| APA | Smart Define. (2015). rarefaction thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/rarefaction/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rarefaction thesaurus" https://smartdefine.org/rarefaction/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, rarefaction thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/rarefaction/thesaurus/synonyms>. |
| MLA | Smart Define. "rarefaction thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/rarefaction/thesaurus/synonyms> |