Not too many words that contain the letter Z end with K: razorback zonk zwieback
Azure, ozone, pizazz, dazzle, fizzle(d), frazzle(d), nozzle, brazier, daze(d), gaze(d), grizzled, grizzly, haze(d), jazz, jazzy, lazy, laziness, glaze(d), maze, prize, prizes, prized, quiz, quizzed,...
Zebra, zygote, zipper, zealous, etc.
Buzz Zebra Capitalize Freeze Zen Zero Seize
DonkeyKeyYuckYickSuckyYuckyMuckyKayakYak