Interjections can contain sounds that don't occur in ordinary words. In German there's "tja", and in English there's "tsk", which is a click, quite an unusual s

Interjections can contain sounds that don't occur in ordinary words. In German there's "tja", and in English there's "tsk", which is a click, quite an unusual sound: https://en.wikipedia.org/wiki/Dental_click https://en.wikipedia.org/wiki/Dental_click