This is the 1276th most frequent Polish word.
gwiazd
"Stars" (genitive plural form of "gwiazda").
Here, 'gwiazd' is the genitive plural form of 'gwiazda' (star), used to indicate the possession or association (stars in the sky).
Wieczorem widać na niebie mnóstwo gwiazd.
In the evening, you can see numerous stars in the sky.
Here, 'gwiazd' again is in genitive plural, used to describe association (stars of music).
Jestem organizatorem koncertu z udziałem gwiazd muzyki.
I am the organizer of a concert featuring music stars.
Here, 'gwiazd' is used as a genitive plural denoting description and relationships (bright stars in the sky).