This is the 770th most frequent Slovak word.
nemecka
The Slovak word "nemecká" means "German" (adjective, feminine form).
In this sentence, 'Nemecka' is a form of the proper noun representing the country Germany, here in genitive case indicating 'from Germany.'
Moja sestra je z Nemecka.
My sister is from Germany.
Here, 'nemeckú' is an adjective describing 'literature,' and is the accusative singular feminine form of 'nemecký' (German).
Študujem nemeckú literatúru.
I study German literature.
In this sentence, 'nemeckej' is an adjective describing 'kitchen/cuisine,' and is the genitive singular feminine form of 'nemecký' (German).