[sigh] A pronoun is a word you use instead of a proper name. “The Model T was built for decades. It was America’s most popular car.” In that sentence ‘it’ is a pronoun.

“The Model T was a common sight in every city and town. Everyone knew someone who drove a Tin Lizzie.” Tin Lizzie was another name for the Model T. ‘Tin Lizzie’ isn’t a pronoun, it’s a proper name.

GOP isn’t a ‘pronoun’ and never was. It’s always been a proper name and that’s how I used it. Like the word ‘fish’ it can mean a single member of the Republican Party, or the Party as a whole.