This is the 15113th most frequent Polish word.
rzepakowego
"Rzepakowego" means "of or relating to rapeseed."
Here, 'rzepakowemu' is used in the instrumental case as an adjective modifying 'olejowi,' showing the noun's role in the sentence.
Smak tego chleba zawdzięczamy olejowi rzepakowemu.
The taste of this bread is owed to rapeseed oil.
The word 'rzepakowy' is used here as an adjective describing the type of oil, indicating it is made from rapeseed.
Olej rzepakowy jest zdrowy dla naszego serca.
Rapeseed oil is healthy for our heart.
In this sentence, 'rzepakowe' modifies 'kwiaty' to specify the type of flowers—those of rapeseed plants.