The best replacement for swamp is marsh.

The best alternatives to swamp are rated as following:
★★★★★  marsh
★★★★  bog
★★★  bayou
★  everglades
★  wetlands
★  wetland
★  pond
  slough
  slue
  jungle
  salt marsh

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Google Trends

Scale is based on the average worldwide traffic of swamp in all years. Click on graph for more.
swamp
marsh
bog