First offender and Juvenile delinquent

First offender noun - Someone convicted for the first time.

Juvenile delinquent and first offender are semantically related In some cases you can use "Juvenile delinquent" instead a noun phrase "First offender".

Juvenile delinquent noun - A young offender.

First offender and juvenile delinquent are semantically related in young criminal topic. You can use "First offender" instead a noun phrase "Juvenile delinquent".