tóng​yīn

homophonous

同音 tóng​yīn
homophonous noun
sharing the same pronunciation but having different meanings

In Mandarin, 'yǒujì' (to mail) and 'yóujì' (travelogue) are homophones.

unison verb
sounding the same pitch or frequency in music

The two voices sing in unison here.

Frequency

Movie subtitles
2.27 per million appears in 1% of films
Written text
0.681 per million

Sources

Definitions
CC-CEDICT