bonding vs fastening

bonding and fastening both are nouns.

Word	Noun	Adjective	Verb	Adverb
bonding	Yes	No	No	No
fastening	Yes	No	No	No

As nouns, fastening is a hypernym of bonding; that is, fastening is a word with a broader meaning than bonding:

Other hypernyms of bonding include attachment.

bonding (noun)	fastening (noun)
fastening firmly together	the act of fastening things together
(dentistry) a technique for repairing a tooth; resinous material is applied to the surface of the tooth where it adheres to the tooth's enamel	restraint that attaches to something or holds something in place
a close personal relationship that forms between people (as between husband and wife or parent and child)