Bog
Swamp
noun, suffix
ぬま
沢 (さわ) Mountain Stream, Swamp
沼沢 (しょうたく) Swamp, Marsh
沼 (ぬま) Bog, Swamp
泥沼 (どろぬま) Quagmire, Bog, Morass
沼地 (ぬまち) Marshland, Wetland, Swampland
湿地 (しっち) Wetlands
A swamp has trees. A bog is more like a wet field.