| nascency(noun, beginning, birth) | |
| nucleus(noun, support, action, cause, start) | |
| originating point(expression, idiom) | |
| parentage(noun, cause, origin, descent, background) | |
| paternity(noun, cause, point, beginning, foundation) | |
| prime mover(noun, expression, idiom, cause, reason) | |
| prototype | |
| radix(cause, origin) | |
| rootage | |
| quotation(noun, note, suggestion, mention, remark) | |
| semen(noun, beginning, stone, nut, seed) | |
| alpha(noun, cause, start, top, beginning) | |
| betrayer(noun, grass, sneak, decoy, informer) | |
| bloodline | |
| bug | |
| channel | |
| class(noun, set, kind, group, sort) | |
| consideration(noun, reason, matter, agent, root) | |
| consultation | |
| credit |
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| APA | Smart Define. (2015). source thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/source/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "source thesaurus" https://smartdefine.org/source/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, source thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/source/thesaurus/synonyms>. |
| MLA | Smart Define. "source thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/source/thesaurus/synonyms> |