This is the 6551st most frequent Portuguese word.
espumante
Sparkling wine.
In this sentence, 'espumante' is used as a noun referring to a type of wine, specifically sparkling wine.
Eu abri uma garrafa de espumante para a comemoração.
I opened a bottle of sparkling wine for the celebration.
Here, 'espumantes' is used as an adjective, describing the waters as foaming and bubbly.
As águas da cachoeira estavam tão agitadas que pareciam espumantes.
The waters of the waterfall were so agitated that they seemed foamy.
In this case, 'espumante' is an adjective describing the foamy or bubbly texture of the soap.