kolega

/kɔˈlɛɡa/noun, masculine (person)#529 most common

friend, colleague, buddy

Usage noteDeclines like a feminine noun in the singular (kolegi, koledze); female form: koleżanka.

Examples

To mój kolega z pracy.
This is my colleague from work.
Wieczorem gram w piłkę z kolegami.
In the evening I play football with my friends.