Ending in AK

• doublespeak
• electroweak

Ending in CK

• biofeedback
• breechblock
• candlestick
• chockablock
• crackerjack
• diamondback
• fiddlestick
• leatherback
• leatherneck
• quarterback
• quarterdeck
• shuttlecock
• singlestick
• spatterdock
• stagestruck
• steeplejack
• stickleback
• weathercock

Ending in IK

• apparatchik
• computernik
• realpolitik

Ending in LK

• countryfolk

Ending in NK

• countersink
• countersunk
• doublethink

Ending in RK

• cabinetwork
• journeywork
• latticework
• passagework
• plasterwork
• stringybark
• trelliswork
• trestlework