The word gal exists it’s just not popular anymore.
It's also just slang term derived from a lazy pronunciation of the word "girl."
Maybe if you’re a cattle rancher
In the south west
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When I was learning German I was told that if I call a Frau a Mädchen she might get offended or look at me funny. Calling grown women girls seems to only be an English thing.
English has a *LOT* of redundant words.
You've clearly never been to the UK