You asked:

is mauna kea taller than mt everest

No. Mauna Kea is not taller than Mount Everest. Mauna Kea is 13,803 feet and Mount Everest is 29,029 feet.
Mauna Kea
Mauna Kea

Mauna Kea, the dormant volcano in the Hawaiian Islands which is, measuring from its base underwater to its tip, the tallest mountain in the world

Mount Everest
Mount Everest

Mount Everest, the tallest mountain in the world

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