2 sentences for 同音 (tóng​yīn)

1. 两个声部在此处以同音齐唱。

   liǎng gè shēng​bù zài cǐ chù yǐ tóng​yīn qí​chàng.

   The two voices sing in unison here.

   Source: Dong Chinese Dictionary

2. 在普通话中，“邮寄”和“游记”是同音词。

   zài pǔ​tōng​huà zhōng,“ yóu​jì” hé“ yóu​jì” shì tóng​yīn cí.

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

   Source: Dong Chinese Dictionary