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what is the name of the highest mountain in south america
Aconcagua is highest mountain in South America.
how high is the aconcagua
At 22,837 feet, not only is it the highest mountain in South America, it is the tallest in all of the Americas, as well as the Southern and Western Hemispheres.
what is the tallest mountain worldwide
The peak of Mount Everest is 8,850 meters above sea level. No other mountain on Earth has a higher altitude. However, some mountains might be considered taller.
are there any mountains considered taller than mount everest
Mauna Kea has an altitude of 4,205 meters - much lower than Mount Everest. If the distance from the bottom of ocean is measured Mauna Kea is taller than Mount Everest.

Question: any other mountains
Self-contained rewrite: any other mountains considered taller than mount everest besides mauna kea