Commonest

Commonest[list]
gives a list of the elements that are the most common in list.

Commonest[list, n]
gives a list of the n most common elements in list.

When several elements occur with equal frequency, Commonest[list, ...] picks first the ones that occur first in list.

Commonest[list, n] returns the n commonest elements in the order they appear in list.

Obtain the elements with highest frequency:

Obtain 4 most common elements: