bog as synonym for toilet
all of the following have "bog" as synonym:
ENVO:00000044 ! peatland [subclass: "wetland area"]
ENVO:01000527 ! flush toilet fixture [subclass: "toilet fixture"]
ENVO:01000534 ! pour-flush toilet fixture [subclass: "flush toilet fixture"]
ENVO:01000535 ! pour-flush pit latrine [subclass: "pit latrine"]
ENVO:01001209 ! wetland ecosystem [subclass: "ecosystem"]
much as I like having UK slang for anything potty related, not sure it's worth confusing NER tools here.
If we do retain it, we should have an annotation property for slang, and keep it only for the parent class, since AFAIK nobody uses "bog" to mean "pit latrine"
(it may be tempting to think of this at the etymology but don't think that's the case https://en.wiktionary.org/wiki/bog#Etymology_1 )
I see your point, however, we'd want some colloquialism in there to catch mass media or informal reports when it comes to domains like public health. I like the idea of a slang annotation. Is there anything standard out there for slang/colloquialism?