If a word conforms to a special rule, I call it a peccato word. Here is a list of peccato and not-peccato words:
And CSV version:
QUESTION: What is the rule to tell whether a word is a peccato word or not?
it depends on the spelling of the words, not on the meanings
It is somehow related to the pronunciation of the word "peccato", not to its meaning.
Write down the alphabet. You should easily be able to find a necessary condition for a word to be a peccato word.
Hint 4 (strong hint)
the rule is related to the letter O.