gwiazd

In a sentence

• Wieczorem widać na niebie mnóstwo gwiazd.

  In the evening, you can see numerous stars in the sky.

  Here, 'gwiazd' is the genitive plural form of 'gwiazda' (star), used to indicate the possession or association (stars in the sky).

• Jestem organizatorem koncertu z udziałem gwiazd muzyki.

  I am the organizer of a concert featuring music stars.

  Here, 'gwiazd' again is in genitive plural, used to describe association (stars of music).

• Podziwialiśmy niebo pełne jasnych gwiazd.

  We admired the sky full of bright stars.

  Here, 'gwiazd' is used as a genitive plural denoting description and relationships (bright stars in the sky).