huí​yīn

echo

回音 huí​yīn
echo noun
the reflection of sound waves off a surface back to the listener

In the empty tunnel, you can hear a clear echo when you speak.

reply noun
an answer or response to a letter, message, or inquiry

I waited three days for a response, but he never contacted me.

turn noun
a melodic ornament in music consisting of four notes that wind around the principal note

Frequency

Movie subtitles
2.50 per million appears in 1% of films
Written text
2.34 per million

Sources

Definitions
CC-CEDICT