For the rest of the those that are not familiar with the word:
nonce (plural nonces)
Noun
1). (British, Ireland, derogatory) A sex offender, especially one who is guilty of sexual offences against children. [1975]
2). (by extension) A pedophile.
3). (British, Ireland, prison slang, derogatory) A police informer, one who betrays a criminal enterprise [2000] synonym
Synonyms: see snitch
3). (British, Ireland, slang, derogatory) A stupid or worthless person. [2002]
Thank you for elevating my vocabulary kind stranger.