Stream – el arroyo
(Pronounced ah-rroh-yoh)
To remember that stream is pronounced ah-rroh-yoh (arroyo) in Spanish, use the following mnemonic:
The stream was too small for a rowing race, so they played with their yo-yo's (arroyo) instead.
Arroyo is masculine, so it's el arroyo. Imagine a huge elephant bathing in a small stream.