scam
A four letter word for con game is scam.
con
The term "bunco squad" is a word for police units assigned to investigate frauds and con artists. Because most frauds and con artists use the internet today, investigation by law enforcement is usually done by internet specialist.
con
con, gyp
Con, gyp, lie.
con-sign
con + sign = consign
con
pro, con
con as in 'He tried to con me out of my front-row seat.' sop
same as everyone else.