error, mistake / fault, blame / wrong, misdemeanor / foul, fault (infraction of the rules)

(sports) unforced error

through lack of; for want of; because of a lack of

(tennis) double fault

without fail, for sure, definitely / Used other than figuratively or idiomatically: see sans, faute; flawlessly, perfectly

Used other than figuratively or idiomatically: see sans, faute; flawless, perfect

misspelling

faultless performance

for want of something better, faute de mieux

typing error, typo (typographical error)