20
marsh(noun, plain, wild, mess, dry)
20
swamp(noun, flat, plain, wild, mess)
18
bog(noun, wild, dry, void, barren)
17
quagmire(noun, wild, mess, dry, muddle)
16
slough(noun, dry, swamp, bog, quagmire)
15
morass(noun, dry, swamp, mud, slough)
12
marshland(noun, flat, plain, wild, dry)
12
mire(noun, dry, swamp, mud, slough)
10
moor(noun, waste, wild, void, barren)
6
wash(bog, marsh)
4
flat
4
moss(noun, swamp, mud, quagmire, marsh)
4
quag(noun, dry, swamp, slough, bog)
4
swampland(noun, dry, swamp, marsh)
4
wetland(noun, dry, marsh)
3
everglade
3
fenland
3
glade(noun, marsh)
3
mud(noun, marsh)
3
plain(noun, flat, valley)
11 years ago|6.1k views|share |citing 
APASmart Define. (2015). fen thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/fen/thesaurus/synonyms
ChicagoSmart Define. 2015. "fen thesaurus" https://smartdefine.org/fen/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, fen thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/fen/thesaurus/synonyms>.
MLASmart Define. "fen thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/fen/thesaurus/synonyms>