Other forms: republicans
The adjective republican describes a government made up of representatives who are elected by the citizens. If you live in the United States, you’re part of a republican system of government.
In a republican government, citizens have a lot of power — their vote determines who is running the government. The word republican has a noun and an adjective form. The noun is for a person who supports that style of government, and the adjective describes something with those characteristics. But if you see republican with a capital letter “r” — Republican — then that refers to a member of the Republican Party.