From Teflpedia

While is an English word; this article also discusses the related whilst

Despite beginning with the wh digraph, while is not a wh- word.

As a noun, it means a short period of time; "please wait for a while." It can also be a verb, (a regular verb) e.g. "to while away the hours"

As a conjunction/adverb it means "at the same time as". This can be used in time adverbials such as time clauses.

While can also be used for comparison, meaning "whereas". For example, ...

In British English, speakers/writers may replace "while" with "whilst", but only as a conjunction/adverb particularly in formal writing.[1]

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