Yes. You can use it as the subject of a sentence: "Republicans are divided in their feelings about their top candidates." That's how you know it's a noun--a word that names a person, place, or thing.
He was a Republican, as was his son, George W. Bush. Both were U.S. presidents.
republican
drishawn Givens is the republican
republicans.
Republican party
Republican!
It is called The Republican
Nebraska is one of the most solid Republican states in the US.
As of now, Oklahoma has far more Republicans. It's one of the "reddest" states in the country next to Utah. It has a Republican governor, 2 Republican Senators, all Republican Representatives, and always votes Republican for president.
A democrat. His father Joe Sr. hated republicans. Did you know that a majority of the Kennedy family don't like Arnold Schwarzenegger because he is a republican?
Republicans
Democratic-Republicans