attachment vs tenderness

attachment and tenderness both are nouns.

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

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

Other hypernyms of attachment include affection, affectionateness, fondness, heart, philia, warmheartedness, warmness.

attachment (noun)	tenderness (noun)
the act of fastening things together	a tendency to express warm and affectionate feeling
the act of attaching or affixing something	a feeling of concern for the welfare of someone (especially someone defenseless)
faithful support for a cause or political party or religion	a positive feeling of liking
a supplementary part or accessory	warm compassionate feelings
a connection that fastens things together	a pain that is felt (as when the area is touched)
a writ authorizing the seizure of property that may be needed for the payment of a judgment in a judicial proceeding
a feeling of affection for a person or an institution