The term 'Sound of Satisfaction' can be described by four different crossword solutions: PURR (4 letters), ahh (3 letters), aah (3 letters), and aaah (4 letters). Purring is a sound made by cats that is usually associated with contentment. Ahh and aah are both sounds of appreciation or pleasure, while aaah is a longer version of the same sound. All of these sounds are associated with satisfaction and contentment.