ガス欠[gasuketsu] running out of gasoline (petrol)
欠けがえのない[kakegaenonai] irreplaceable
間欠[kanketsu] intermittence
金欠[kinketsu] running out of money
欠かす[kakasu] to miss (doing)

欠く[kaku] to chip
欠け[kake] fragment
欠ける[kakeru] to be chipped
欠員[ketsuin] vacancy
欠課[kekka] cutting class

缺け[kake] fragment
缺ける[kakeru] to be chipped
欠缺[kenketsu] lacuna

法の欠缺[hounokenketsu] gap in the law
記録欠缺の主張[kirokukenketsunoshuchou] alleging diminution
欠缺利札[kenketsurisatsu] invalid coupon