This is the 10140th most frequent Polish word.
boczniaka
"Boczniaka" means "oyster mushroom" in English.
Here, 'boczniaka' is in the singular accusative case, as the object of admiration within the sentence.
Podziwiałem rosnącego boczniaka w lesie.
I admired a growing oyster mushroom in the forest.
The word 'boczniaka' here is used in the singular accusative case, indicating the object of the sentence, which is being bought.
Kupiłem boczniaka w sklepie.
I bought an oyster mushroom in the store.
In this sentence, 'boczniaka' is used in the singular genitive case, denoting 'from oyster mushroom' to describe the main ingredient of the dish.