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Synonyms for Breach (same or very similar meaning)

WordNet sense 1 (a personal or social separation (as between opposing factions)):
break, rift, rupture, severance

WordNet sense 2 (act in disregard of laws, rules, contracts, or promises):
offend, transgress, violate, infract, go against

WordNet sense 3 (make an opening or gap in):
gap


From the ODE community, based on WordNetadd/edit