English Thesaurus
(noun) 
Definition
a wet spongy area of land
We walked steadily across moor and bog.
Synonyms
marsh
a recently reclaimed saltwater marsh
,
moss (Scottish, Northern England, dialect)
,
swamp
Much of the land is desert or swamp.
,
slough
,
wetlands
,
fen
Peat is growing in the fen.
,
mire
Be careful not to get stuck in the mire.
,
quagmire
Overnight rain had turned the grass airstrip into a quagmire.
,
morass
a morass of gooey mud
,
marshland
,
peat bog
,
pakihi (New Zealand)
,
muskeg (Canadian)
(noun) 
Definition
a toilet
(British, informal)  I'm reading it on the bog.
Synonyms
lavatory
a public lavatory
,
toilet
They took a break so he could go to the toilet.
,
loo (British, informal)
,
can (US, Canadian, slang)
,
john (slang, mainly US, Canadian)
,
bogger (Australian, slang)
,
brasco (Australian, slang)
,
throne (informal)
,
privy
an outside privy
,
latrine
,
crapper (taboo, slang)
,
khazi (slang)
,
W.C.
(noun) 
Definition
a toilet
`I'm in the bog!' she heard him call.
Synonyms
bathroom
She had gone to use the bathroom.
, ,
toilet
I ran to the toilet, vomiting.
,
loo (British, informal)
,
bogger (Australian, slang)
,
brasco (Australian, slang)
, , ,
outhouse
,
washroom
,
powder room
To the left of the hall was a powder room.
,
water closet
,
gents or ladies (British, informal)
,
ladies' room
,
little boy's or little girl's room (informal)
,
W.C.

Additional synonyms

in the sense of fen
Definition
low-lying flat marshy land
Peat is growing in the fen.
Synonyms
moss (Scottish),
bog,
slough,
holm (dialect),
pakihi (New Zealand),
muskeg (Canadian)
in the sense of mire
Definition
a boggy or marshy area
Be careful not to get stuck in the mire.
Synonyms
bog,
fen,
pakihi (New Zealand),
muskeg (Canadian)
in the sense of morass
Definition
a tract of swampy low-lying land
a morass of gooey mud
Synonyms
bog,
slough,
fen,
moss (Scottish, Northern England, dialect),
marshland,
muskeg (Canadian)

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Source

Thesaurus for bog from the Collins English Thesaurus
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