A toilet in the U.S. Marines or U.S. Navy is traditionally known as a 'head', so someone who needs to go to the bathroom is "making a head call." The Army and Air Force makes do with the Boy Scout term "latrine."
Latrine
Because one "toils" there.
No, he goes down the sink
Toilet
crapopoop
Toilet
'Bog' is a slang term sometimes used in Britain for a toilet.
The name for the wax seal for a toilet is a wax toilet ring. Some people also call this item a toilet wax bowl gasket.
Shooter
Call the ambulance asap!
call the plumber
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I don't think there is an actual scientific name for it, but i would suggest toilet phobia.