what else
"Else" means "other things". It's often used with questions:
Who else is coming?
We should definitely go. When else will we get a chance to visit Spain?
"What else" means "what other things". You start a question with "what else" when you have some examples of things, but you want more:
What else should we bring?
What else can I say? I've already apologized multiple times.
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