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

闕く[kaku] to chip
闕け[kake] fragment
闕ける[kakeru] to be chipped
帝闕[teiketsu] imperial palace gate
闕腋の袍[kettekinohou] robe worn by military officials with a round collar, unstitched open sides and no ran

闕腋[ketteki] unstitched, open side of some traditional Japanese clothing
宮闕[kyuuketsu] Imperial palace
闕所[kessho] confiscation of property (Edo period)
闕望[ketsubou] disappointment