Colloquialism
/kəˈloʊ.kwi.əˌlɪz.əm/
"Colloquialism" in a Sentence (2 examples)
Before embarking on her trip, Kaefer expected to find a pan-Antarctic vocabulary, but quickly discovered there were distinct colloquialisms within each station.
The differences between slang, colloquialism and jargon are not clear-cut.