Regarding Australian states and territories, say you have a certain word in your state. Have you come across different words in other states that mean the same thing?

Australians desperately hang on to the small lexical differences between States, as you’ll see here, because otherwise Australian English is ludicrously homogeneous geographically. Variation in Australian English – Wikipedia

The names for different sizes of beer glasses (Australian English vocabulary – Wikipedia) is kind of the counterpart to the renowned Eskimo words for snow. (Yes, the jokes do write themselves.) And there is bizarre State-based variation, just as there was beer parochialism in the days before craft beer.

There used to be a similar diversity of words for uncouth and unsophisticated people (yes, again the jokes do write themselves); but they have all been replaced now by Bogan, which has now also come to be reclaimed as a positive.

Where Australia specialises words about beer glasses, Greece specialises words about souvlaki. A döner kebab is a gyros in the South; in the north it’s a sanduits.

The other shibboleth of Northern vs Southern Greek vocabulary is the word for ‘on the ground’. Northern Greek uses the word kato ‘down’ for ‘on the ground’ as well; Southern Greek has retained khamo, khamu for the latter—earning them the moniker khamudzides ‘Down-On-The-Grounders’ from northerners.

See this post on a recent book about the slang differences between the two, written by Haralambos Metaxas, who is also a contributor to the Greek equivalent of Urban Dictionary, slang.gr