noun
Refers to a person who opposes or betrays an authority, group, or established order. Often used in political, military, or dramatic contexts.
彼は王国に対する反逆者として捕らえられた。
He was captured as a rebel against the kingdom.
反逆者は厳しく罰せられるだろう。
The traitor will be severely punished.
謀反人 is a more historical or literary term for someone who plots a coup or uprising, often against a ruler.
Compound of 反逆 (rebellion, treason) and 者 (person). The word is straightforwardly derived from its kanji components.