儿子 (ér zi) means “son” | MotiTan Chinese Dictionary

More examples

我有两个儿子，他们都很活泼。wǒ yǒu liǎng gè ér zi tā men dōu hěn huó pō

I have two sons, and they are both lively.

The male-child link between a parent and the next generation.

孩子hái zi: A child in relation to a parent, of any age or gender.
女儿nǚ ér: A female child in relation to a parent.

指父母的男性子女，表示与父母的亲属关系。zhǐ fù mǔ de nán xìng zí nǚ biǎo shì yǔ fù mǔ de qīn shǔ guān xì

儿子 (érzi, "son") is made from 儿 (ér, "child") + 子 (zi, "child or offspring"), and their shared child meaning helps identify the family relationship.

The form stays the same for one son and several sons, so numbers and context carry the difference that English often shows with a plural ending.