| reach | |
| recess(noun, low, cup, indentation, cavity) | |
| refluence | |
| reflux | |
| regurgitation | |
| reservoir | |
| rime | |
| sag(dish, sink, dip, pot, bowl) | |
| schism(noun, break, split, division, disagreement) | |
| scissure | |
| seam | |
| sinkage(noun, dish, sink, dip, pot) | |
| sinkhole(noun, dish, sink, dip, pot) | |
| slot | |
| slouch | |
| stoma | |
| straits | |
| swirl | |
| tabula rasa(expression, opening, void, hollow) | |
| tank |
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| APA | Smart Define. (2015). gulf thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/gulf/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "gulf thesaurus" https://smartdefine.org/gulf/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, gulf thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/gulf/thesaurus/synonyms>. |
| MLA | Smart Define. "gulf thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/gulf/thesaurus/synonyms> |