| portcullis | |
| ravine | |
| roadblock | |
| safeguard(noun, defense) | |
| screen(noun, defense) | |
| shelter(noun, defense) | |
| sunk fence(expression, idiom, defense) | |
| tunnel | |
| watercourse(noun, drain, channel, conduit, rack) | |
| waterway(noun, drain, ditch, channel, pit) | |
| weir | |
| abyss | |
| cut(drain, ditch, channel, pit, trench) | |
| dam | |
| aorta | |
| approach trench | |
| arch dam | |
| argument(noun, defense) | |
| armor(noun, defense) | |
| artery |
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| APA | Smart Define. (2015). moat thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/moat/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "moat thesaurus" https://smartdefine.org/moat/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, moat thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/moat/thesaurus/synonyms>. |
| MLA | Smart Define. "moat thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/moat/thesaurus/synonyms> |