Misdemeanour
Part of speech: noun
Definition: A crime usually punishable upon conviction by a small fine or by a short term of imprisonment. In the USA, misdemeanants usually are incarcerated in county jail for less than one year, but felons usually are incarcerated in state or federal prison for more than one year. Crimes which are punishable by large fines or by longer imprisonment are sometimes called felonies.
Offence
Part of speech: noun
Definition: Alternative spelling of offense.
Example sentence: If you go into a police station and report a burglary the first question is not: 'Are you telling the truth?' If you are the victim of a sexual offence, very often in the past that has been the first question.