| swamp ash | (n) small ash of swampy areas of southeastern United States, Syn. Fraxinus caroliniana |
| swamp azalea | (n) shrub growing in swamps throughout the eastern United States and having small white to pinkish flowers resembling honeysuckle, Syn. white honeysuckle, Rhododendron viscosum, swamp honeysuckle |
| swamp birch | (n) birch of western United States resembling the paper birch but having brownish bark, Syn. Western birch, water birch, Betula fontinalis, mountain birch, Western paper birch |
| swamp buggy | (n) an amphibious vehicle typically having four-wheel drive and a raised body, Syn. marsh buggy |
| swamp candles | (n) North American plant with spikes of yellow flowers, found in wet places, Syn. Lysimachia terrestris |
| swamp chestnut oak | (n) medium to large deciduous tree of moist areas of southeastern United States similar to the basket oak, Syn. Quercus michauxii |
| swamp cottonwood | (n) North American poplar with large rounded scalloped leaves and brownish bark and wood, Syn. Populus heterophylla, downy poplar, black cottonwood, swamp poplar |
| swamp dewberry | (n) of eastern North America, Syn. swamp blackberry, Rubus hispidus |
| swamp fever | (n) an infectious disease cause by leptospira and transmitted to humans from domestic animals; characterized by jaundice and fever, Syn. leptospirosis |
| swamp fly honeysuckle | (n) a variety of fly honeysuckle |
