What is the meaning of -ak?

A suffix used to form the plurals of animate words.

First-person singular absolutive enclitic pronoun; I, me

A suffix used to form the plurals of animate words.

Absolutive plural suffix.

Ergative singular suffix.

-s, -es

used to form demonyms

used to form various nouns, many of them colloquial

used to form names of dances and sports

used to form diminutives of animals

Suffix appended to words to create a masculine noun, usually denoting a performer, feature, human relation, result of an action, object, diminutive or a proper name.

Suffix appended to the present stem of verbs to form an adjective denoting a feature or a dimension.

Creates nouns out of verbs.

Source: wiktionary.org