Answer:
double-talk
Step-by-step explanation:
According to the given excerpt from the General Prolgue to the Canterbury Tales, the author talks about a person who makes a living out of swindling country priests or some "backwoods parson" using relics.
It is noted that he would make more money than any parris priest has seen in two months through his double-talk.
Therefore, the word which best characterises the pardon-seller as a swindler is "double-talk*.