Mammoth Uncensored Word List:
55 words ending with nk, 5 letters long

blank blink blunk boink brank brink chank chink chunk clank clink clonk clunk crank cronk deink drank drink drunk flank flunk frank plank plink plonk plunk prank prink pronk quonk reink shank skank skink skunk slank slink slunk spank spink spunk stank stink stonk stunk swank swink thank think thunk trank tronk trunk twank twink