First offender and Thug

First offender noun - Someone convicted for the first time.

Thug and first offender are semantically related. in young criminal topic. In some cases you can use "Thug" instead a noun phrase "First offender".

Thug noun - A violent, brutal person who is often a member of an organized gang.

First offender and thug are semantically related. You can use "First offender" instead a noun "Thug".