What's the difference between while and whilk?

While

Definition:

(n.) Space of time, or continued duration, esp. when short; a time; as, one while we thought him innocent.
(n.) That which requires time; labor; pains.
(v. t.) To cause to pass away pleasantly or without irksomeness or disgust; to spend or pass; -- usually followed by away.
(v. i.) To loiter.
(conj.) During the time that; as long as; whilst; at the same time that; as, while I write, you sleep.
(conj.) Hence, under which circumstances; in which case; though; whereas.
(prep.) Until; till.