Answer:
The word tenderness means soft and a feeling of concern and gentleness. It refers to love and affection and warmth.
Whereas sentiments are known as feelings and emotions that one feels and like to show others.
Tenderness can be used as a sentiment because sentiments can be harsh and they can be soft. Sentiments can be positive and they can be negative.
Tenderness would fall when someone is so soft and bleak of heart that they cry when the other cries and feels what the other is going through, either happy or sad.