This is the 696th most frequent Croatian word.
nogometne
"Nogometne" means "football" or "soccer-related" in English.
In this sentence, 'nogometne' qualifies 'utakmice' (matches), specifying that these matches pertain to soccer.
Gledali smo nogometne utakmice cijeli vikend.
We watched soccer matches all weekend.
Here, 'nogometne' is used as an adjective describing 'lopte' (balls), indicating that the balls are related to soccer.
Nogometne lopte su okrugle.
Soccer balls are round.
The word 'nogometne' modifies 'ekipe' (team), denoting that it is a soccer team.