Another word for default
failure, lack, delinquency, dereliction, omission, error, failure to act, inaction, failure to pay, nonpayment, oversight, neglect, negligence, shortcoming, want, inadequacy, insufficiency, failure to appear, lapse, fault, nonfeasance, nonfulfillment, arrears, arrearage; see also omission 1.
Another word for defaultnoun
Nonperformance of what ought to be done:delinquency, dereliction, failure, neglect, omission. (Law) nonfeasance. See do