This is the 4595th most frequent Polish word.
masło
Butter.
The word 'masło' is used as the subject of the sentence in its nominative case, denoting the object being discussed.
Masło jest smaczne na chlebie.
Butter tastes good on bread.
The word 'masło' is in the accusative case, functioning as the direct object of the action described by the verb.
Potrzebuję kupić masło ze sklepu.
I need to buy butter from the store.
Here 'masła' is the genitive case, used after verbs that require this case to describe quantity or association.