bog, peat bog – wet spongy ground of decomposing vegetation; has poorer drainage than a swamp; soil is unfit for cultivation but can be cut and dried and used for fuel
3.
slough – a stagnant swamp (especially as part of a bayou)
swamp, swampland – low land that is seasonally flooded; has more woody plants than a marsh and better drainage than a bog
4.
slough – any outer covering that can be shed or cast off (such as the cast-off skin of a snake)
covering, natural covering, cover – a natural object that covers or envelops; “under a covering of dust”; “the fox was flushed from its cover”
Verb
1.
slough – cast off hair, skin, horn, or feathers; “our dog sheds every Spring”