This is the 12434th most frequent Russian word.
керамическую
The Russian word "керамическую" means "ceramic" (feminine accusative singular form).
In this sentence, "керамическую" is used to describe the material of the cup, functioning as an attributive adjective modifying the noun "чашку" (cup).
Я купил керамическую чашку в магазине.
I bought a ceramic cup at the store.
Here, "керамическую" is used to specify the type of vase she intends to create, acting as an attributive adjective for the noun "вазу" (vase).
Она мечтает создать керамическую вазу своими руками.
She dreams of creating a ceramic vase with her own hands.
In this instance, "керамическую" describes the kind of dishes (referring to their material), functioning as an adjective for "посуду" (dishes).