This is the 4488th most frequent Japanese word.
学童
"学童" means "schoolchild" or "pupil."
Here, '学童' refers to school-age children, specifically elementary school students, and it's used to describe their activity.
学童たちは放課後に公園で遊びます。
The schoolchildren play in the park after school.
In this context, '学童' is used as part of '学童クラブ,' referring to a program or club for schoolchildren after school.
学童クラブではさまざまな活動が行われます。
Various activities are carried out in the after-school program.
Here, '学童' refers to children within the community who are of school-attending age.