重迭
重叠 (重疊) chóng​dié
overlap verb
to lie over or cover part of something else; to superimpose or telescope

由于设计错误，这两张图纸的内容重叠了。

yóu​yú shè​jì cuò​wù, zhè liǎng zhāng tú​zhǐ de nèi​róng chóng​dié le.

Due to a design error, the contents of these two drawings overlap.

redundancy verb
unnecessary repetition or duplication of content, functions, or roles

这两个部门的职能有很多重叠之处。

zhè liǎng gè bù​mén de zhí​néng yǒu hěn​duō chóng​dié zhī chù.

There is a lot of overlap between the functions of these two departments.

reduplication verb
a grammatical process in which a word or part of a word is repeated

汉语中有许多动词可以重叠使用。

Hàn​yǔ zhōng yǒu xǔ​duō dòng​cí kě​yǐ chóng​dié shǐ​yòng.

There are many verbs in Chinese that can be reduplicated.