- Definitions|2
- Thesaurus|429
- Abbreviations|0
| quarry | |
| quick(noun, cause, source, root, origin) | |
| quintessence(noun, cause, base, source, ground) | |
| radicle(noun, cause, quick, source, root) | |
| radix(noun, cause, quick, source, root) | |
| rhizome(noun, cause, quick, source, root) | |
| riverhead | |
| rock bottom(noun, expression, cause, quick, origin) | |
| sake | |
| score | |
| seed(noun, cause, connection, source, origin) | |
| soul(noun, cause, base, source, ground) | |
| springhead | |
| starting point(noun, expression, cause, quick, root) | |
| stimulation(noun, reason, element, matter, source) | |
| stuff(noun, cause, base, source, ground) | |
| substance(noun, cause, idea, base, essence) | |
| ulterior motive | |
| vocation | |
| wellhead |
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| APA | Smart Define. (2015). mainspring thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/mainspring/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "mainspring thesaurus" https://smartdefine.org/mainspring/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, mainspring thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/mainspring/thesaurus/synonyms>. |
| MLA | Smart Define. "mainspring thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/mainspring/thesaurus/synonyms> |