This is the 7967th most frequent Portuguese word.
ríos
"Ríos" is Spanish for "rivers." The Portuguese equivalent is "rios."
In this sentence, 'rios' is used as a noun to refer to plural rivers, which are natural watercourses.
Os rios correm entre as montanhas.
The rivers flow between the mountains.
Here, the word 'rindo' (phonetically similar to 'rios') is used as the gerund form of the verb 'rir' (to laugh); it's distinct from 'rios'.
Eu estou rindo à toa desde que recebi boas notícias.
I have been laughing uncontrollably since I received good news.
Again, 'rios' functions as a noun referring to rivers, emphasizing its role in ecological contexts.