tenderness vs fondness

tenderness and fondness both are nouns.

Word	Noun	Adjective	Verb	Adverb
tenderness	Yes	No	No	No
fondness	Yes	No	No	No

As nouns, fondness is a hypernym of tenderness; that is, fondness is a word with a broader meaning than tenderness:

Other hypernyms of tenderness include affectionateness, lovingness, warmth.

As nouns, tenderness and fondness are synonyms defined as:

Other synonyms of tenderness include affection, affectionateness, heart, philia, warmheartedness, warmness.

tenderness (noun)	fondness (noun)
a tendency to express warm and affectionate feeling	a quality proceeding from feelings of affection or love
a feeling of concern for the welfare of someone (especially someone defenseless)	a positive feeling of liking
a positive feeling of liking	a predisposition to like something
warm compassionate feelings
a pain that is felt (as when the area is touched)