Under the United Kingdom’s Treason Act of 1351, the American revolutionaries seemingly could have been found guilty of treason under the act’s third clause, if the British had prevailed in the war:
if a man do levy war against our lord the King in his realm, or be adherent to the King’s enemies in his realm, giving to them aid and comfort in the realm, or elsewhere
In 1775, colonial authorities charged John Hancock, Sam Adams, Joseph Warren, and Benjamin Church with high treason and high misdemeanors. The four men eluded arrest.
The American Revolution is probably more accurately classified as a war of independence, in which the citizens of a nation’s colony broke away from that nation, rather than a revolution in which a faction within a country displaced the rulers or ruling party.
In his classic Anatomy of a Revolution, Crane Brinton notes that the American Revolution did not follow the general pattern of revolutions. See http://www.historyteacher.net/EuroProjects/ExamReviewSheets/AnatomyOfARevolution.htm