| marsh(noun, plain, wild, mess) | |
| swamp(noun, flat, plain, wild, mess) | |
| bog(noun, wild, void, barren) | |
| quagmire(noun, wild, mess, muddle) | |
| slough(noun, swamp, bog, quagmire) | |
| morass(noun, swamp, mud, slough) | |
| marshland(noun, flat, plain, wild) | |
| mire(noun, swamp, mud, slough) | |
| quag(noun, swamp, slough, bog) | |
| swampland(noun, swamp, marsh) | |
| wetland(noun, marsh) | |
| muskeg(noun, swamp) |
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| APA | Smart Define. (2015). fen thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/fen/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "fen thesaurus" https://smartdefine.org/fen/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, fen thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/fen/thesaurus/synonyms>. |
| MLA | Smart Define. "fen thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/fen/thesaurus/synonyms> |