- Definitions|1
- Thesaurus|348
- Abbreviations|0
| paternity(cause, foundation, basis) | |
| point(noun, start, beginning, opening, introduction) | |
| principal | |
| promontory(noun, start, beginning, opening, introduction) | |
| quarry | |
| question | |
| reservoir | |
| rise(noun, cause, start, authority, beginning) | |
| riverhead | |
| rock bottom(expression, cause, quick, source, origin) | |
| rootstock(noun, start, point, origin) | |
| seed(noun, cause, source, origin) | |
| seedbed | |
| spring head(expression, idiom, cause) | |
| springhead | |
| start(noun, cause, rise, authority, base) | |
| starting place(expression, cause, source, foundation, basis) | |
| starting point(expression, cause, quick, foundation, basis) | |
| ae source(expression, idiom) | |
| ancestress |
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| APA | Smart Define. (2015). fountainhead thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/fountainhead/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "fountainhead thesaurus" https://smartdefine.org/fountainhead/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, fountainhead thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/fountainhead/thesaurus/synonyms>. |
| MLA | Smart Define. "fountainhead thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/fountainhead/thesaurus/synonyms> |