| antibaryon | |
| antilepton | |
| antimeson | |
| aspect(noun, quality, character, spirit, significance) | |
| assumption(noun, support, action, base, beginning) | |
| asymptote(noun, focus) | |
| atomic particle | |
| attribute(noun, quality, character, spirit, significance) | |
| authority(noun, support, action, base, beginning) | |
| average(noun, middle) | |
| axle(noun, focus) | |
| background(noun, support, action, base, beginning) | |
| backing(noun, support, action, base, beginning) | |
| baryon | |
| basichromatin | |
| be-all and end-all(noun, expression, idiom, quality, character) | |
| bedrock(noun, support, action, cause, start) | |
| beginning(noun, cause, start, base, stone) | |
| beginning bud(noun, expression, heart, core, center) | |
| being(noun, quality, character, spirit, significance) |
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| APA | Smart Define. (2015). nucleus thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/nucleus/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "nucleus thesaurus" https://smartdefine.org/nucleus/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, nucleus thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/nucleus/thesaurus/synonyms>. |
| MLA | Smart Define. "nucleus thesaurus" 24 December 2015. Web. 23 September 2026. <https://smartdefine.org/nucleus/thesaurus/synonyms> |