Mammoth Uncensored Word List:
30 words ending with ck, 11 letters long

biofeedback breechblock candlestick crackerjack diamondback doublecheck fiddlestick fingerstick googlewhack killikinick kinnikinick komondorock leatherback leatherneck monkeytrick needlestick netherstock nonloopback outpolitick quarterback quarterdeck rudderstock scratchback shuttlecock singlestick stagestruck steeplejack stickleback swivelblock weathercock