Preteen and Young one

Preteen noun - A preadolescent boy or girl (usually between 9 and 12 years of age).

Young one and preteen are semantically related in child topic. In some cases you can use "Young one" instead a noun "Preteen", when it comes to topics like very young person.

Preteen and young one are semantically related in child topic. Sometimes you can use "Preteen" instead a noun phrase "Young one", if it concerns topics such as very young person.