All the words I did not recognize were either absolutely British regional slang or they had one or more synonyms that are overwhelmingly more common in the US.

Examples: juggins, freeview, jackfish, redbrick

The US equivalents would be bumpkin, superstation (?), northerns, and ivy (as in Ivy League).

I sort of assumed that the nonsense word generator would make nonsense compounds from valid English words, which is why I rejected those last 3, despite that nagging feeling that they were so simple that someone, somewhere might have used them.