THESAURUS
Secede
abandon, agree to differ, agree to disagree, apostacize, apostatize, be at variance, be in dissent, beg to differ, betray, bolt, break away, change sides, defect, desert, differ, disagree, disagree with, discord with, dissent, dissent from, divide on, drop out, fall away, fall off, forsake, go over, leave, let down, not agree, oppose, pull out, quit, rat, run out on, sell out, switch, switch over, take exception, take issue, turn cloak, withdraw, withhold assent
ROGET THESAURUS
Secede
Disobedience
VB
disobey, violate, infringe, shirk, set at defiance, set authority at naught, run riot, fly in the face of, take the law into one's own hands, kick over the traces, turn restive, run restive, champ the bit, strike, rise, rise in arms, secede, mutiny, rebel.
Dissent
VB
dissent, demur, call in question, differ in opinion, disagree, say no, refuse assent, refuse to admit, cavil, protest, raise one's voice against, repudiate, contradict, have no notion of, differ toto caelo, revolt at, revolt from the idea, shake the head, shrug the shoulders, look askance, look askant, secede, recant.