offender
US /əˈfen.dɚ/
UK /əˈfen.dɚ/

1.
a person who commits an illegal act
:
•
The police are searching for the offender.
•
First-time offenders may receive a lighter sentence.
2.
a person or thing that causes offense or annoyance
:
•
The strong smell from the factory is a major offender.
•
He's a repeat offender when it comes to being late.