This is the 6701st most frequent Polish word.
dziki
"Dziki" means "wild" in English.
Here, 'dzikich' is an adjective used to describe the noun 'zwierząt' (animals), meaning 'wild' or 'untamed'.
Las był pełen dzikich zwierząt.
The forest was full of wild animals.
The word 'dziki' is figuratively used as an adjective here to describe the noun 'entuzjazm' (enthusiasm) as extreme or unrestrained.
Na imprezie panował dziki entuzjazm.
At the party, there was wild enthusiasm.
In this sentence, 'dziki' is a noun referring to a wild boar, indicating the animal itself.