This is the 17343rd most frequent Polish word.
zapachowych
"Zapachowych" means "fragrant" or "scented" in English.
In this sentence, "zapachowych" is an adjective form meaning 'scented', describing the type of candles.
Kupuję świece zapachowe, ponieważ uwielbiam ich aromaty.
I buy scented candles because I love their aromas.
Here, "zapachowych" is used in the genitive plural form of the adjective, referring to 'scented diffusers' in Polish grammar.
Mamy dyfuzory zapachowe w całym domu, aby poprawić atmosferę.
We have scented diffusers throughout the house to improve the ambiance.
In this context, "zapachowych" modifies 'oils', indicating their fragrant nature.