The term 'Sounds of Reproach' refers to vocal expressions of disapproval or criticism. The crossword solutions for this term are 'tsktsk' (6 letters), 'tsks' (4 letters) and 'fies' (4 letters). 'Tsktsk' is an onomatopoeic sound used to express disapproval, while 'tsks' and 'fies' are similar sounds with the same meaning. All three of these sounds are commonly used to express disapproval or criticism in a variety of contexts.