while n., conj., prep., v. a period or interval of time: to wait a long while; all the while, at or during this time; all along:
conj. during or in the time that. throughout the time that; as long as. even though; although
prep. [Archaic.] until.
v.t. to cause (time) to pass, esp. in some easy or pleasant manner (usually fol. by away).
Ref. WordReference Random House Unabridged Dictionary of American English
As a conjunction, you can use “while” to compare two things.
For example: While this hotel is bigger, the other is better.
You can use the word “while” to compare two objects, events, or activities. You compare their characteristics.
Bryan: What will you have for a snack?
Teresa: I don’t know. While the apple is healthier, the cake is delicious.
Bryan: I would choose the apple. It’s good for you.
Teresa: You’re right. I’ll have the apple.
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