This is the 50th most frequent Croatian word.
kuna
"Kuna" is the former currency of Croatia, also meaning "marten," a type of weasel-like animal.
Here, 'kuna' refers to the animal marten, a small carnivorous mammal.
U šumi smo vidjeli kunu koja trči preko puta.
In the forest, we saw a marten running across the path.
In this sentence, 'kuna' is used as the name of the Croatian currency.
Platio sam knjigu s dvadeset kuna.
I paid for the book with twenty kunas.
Here, 'kuna' again refers to the animal marten, but in a symbolic or legendary context.