Using Australia Posts's search, there was no result for GREENMOUNT 4225 nor GREENMOUNT BEACH. (But I do see there are quite a few entries in the dataset that do not resolve via the AUS Post lookup so this may be intentional)
Anyhow leave it up to you, I created a PR that renames GREENMOUT (4225) to GREENMOUT BEACH. Feel free to close/ignore. #16
Locality: GREENMOUNT Postcode 4225 (Coolangatta)
Is it correctly called GREENMOUNT BEACH ? https://www.google.com/maps/place/Greenmount+Beach/@-28.1634335,153.5421139,16.37z/data=!4m5!3m4!1s0x6b9100303e44187f:0x9f4f6cf016dca2e9!8m2!3d-28.1639838!4d153.547601
Using Australia Posts's search, there was no result for GREENMOUNT 4225 nor GREENMOUNT BEACH. (But I do see there are quite a few entries in the dataset that do not resolve via the AUS Post lookup so this may be intentional)
Anyhow leave it up to you, I created a PR that renames GREENMOUT (4225) to GREENMOUT BEACH. Feel free to close/ignore. #16