How to Say "brook" in Spanish
The Spanish word for “brook” is “arroyo” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
small natural stream

Examples
Fuimos a caminar por la orilla del arroyo.
We went for a walk along the bank of the stream.
El agua del arroyo es muy clara y fresca.
The water in the brook is very clear and cool.
Después de la tormenta, el arroyo de la calle se inundó.
After the storm, the street gutter flooded.
Masculine Nouns in -o
Since this word ends in -o, it is masculine. You should use 'el' or 'un' with it: 'el arroyo'.
Arroyo vs. Río
Mistake: “Using 'río' for every body of flowing water.”
Correction: Use 'arroyo' for small, shallow streams. Use 'río' for larger rivers like the Nile or the Amazon.
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