What's the difference between before and while?

Before

Definition:

• (prep.) In front of; preceding in space; ahead of; as, to stand before the fire; before the house.
• (prep.) Preceding in time; earlier than; previously to; anterior to the time when; -- sometimes with the additional idea of purpose; in order that.
• (prep.) An advance of; farther onward, in place or time.
• (prep.) Prior or preceding in dignity, order, rank, right, or worth; rather than.
• (prep.) In presence or sight of; face to face with; facing.
• (prep.) Under the cognizance or jurisdiction of.
• (prep.) Open for; free of access to; in the power of.
• (adv.) On the fore part; in front, or in the direction of the front; -- opposed to in the rear.
• (adv.) In advance.
• (adv.) In time past; previously; already.
• (adv.) Earlier; sooner than; until then.

Example Sentences:

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.

Example Sentences: