Oxford English Dictionary definition of the word 'fraudster'. One who commits fraud, esp. in a business transaction.
OED definition of the word ‘fraudster’

Update: looks like it’s been in use since 1975 – and the first use is from the revered Financial Times!

When did we all adopt the Daily Mail-ism ‘fraudster’ and abandon the perfectly serviceable noun ‘fraud’? I can find ‘fraudster’ in none of my dictionaries – even those supposed to contain ‘new words’ – so its origins are obscure. Google, inevitably, reports 14,900 instances, so it can’t be brand new.