Treason is a serious crime, and treasonists are those who commit it. However, it is also important to understand the opposite of this word - antonyms that reflect loyalty and patriotism. Some antonyms of the word "treasonists" could be loyalists, patriots, nationalists, or faithful citizens. These words stand for those who support and defend their country and its laws, and fight against any act that undermines the nation's security and stability. In short, while treasonists exhibit disloyalty towards their country, antonyms reflect the opposite- loyalty, devotion, and commitment towards their nation.