This is the 11823rd most frequent Polish word.
koziołka
"Koziołka" is the diminutive form of "goat" (male goat or kid) in Polish, meaning "little goat" or "kid."
The word 'koziołka' refers to a young billy goat in the context of this sentence.
Kupiłem małego koziołka na targu.
I bought a little billy goat at the market.
The word 'koziołkiem' indicates a piece of gym equipment used in gymnastics similar to a vault.
Dzieci bawiły się koziołkiem gimnastycznym w sali.
The children played with the gym horse in the hall.
Here, 'koziołka' refers to a young billy goat, and the context is literary.