The term 'Pen Denizens' refers to the inhabitants of a prison or penitentiary. The three crossword solutions for this term are 'convicts' (8 letters), 'SWINE' (5 letters) and 'CONS' (4 letters). Convicts are people who have been found guilty of a crime and sentenced to a period of incarceration. SWINE is an archaic term for criminals, often used to refer to those who are considered to be particularly depraved or immoral. CONS is a slang term for convicts, derived from the word 'CONVICT'.