This is the 4168th most frequent Polish word.
chleb
Bread.
Here, 'chleb' is used as a regular noun referring to bread, a staple food item.
Kupuję chleb w piekarni.
I buy bread at the bakery.
'Chleb' is again a noun, referring to a specific type of bread being tasted.
Ten chleb smakuje wyśmienicie.
This bread tastes excellent.
In this sentence, 'chleba' is the genitive case of 'chleb', used here to indicate possession or connection to 'zapach' (scent).