This is the 726th most frequent Japanese word.
園児
Kindergarten or nursery school child.
The word '園児' refers to young children attending a kindergarten.
その幼稚園には百人の園児がいます。
There are one hundred kindergarteners in that kindergarten.
Here, '園児' indicates a group of children who are attending kindergarten and engaging in activities.
園児たちは毎日楽しく遊んでいます。
The kindergarteners enjoy playing every day.
In this example, '園児' is used to describe an individual child who has joined a kindergarten.