This is the 8219th most frequent Polish word.
orzechy
Nuts.
The word 'orzechy' here refers to nuts as a type of food that is consumed, typically during a meal.
Lubię jeść orzechy na śniadanie.
I like eating nuts for breakfast.
The word 'orzechów' (plural genitive form of 'orzechy') specifies hazelnuts, a subtype of nuts, in the context of purchasing food.
Wczoraj kupiłem paczkę orzechów laskowych.
Yesterday I bought a bag of hazelnuts.
The word 'orzechom' (plural dative form of 'orzechy') is used in the context of indicating what contributes to the cake's tastiness.