fastening vs bonding

fastening and bonding both are nouns.

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

As nouns, bonding is a hyponym of fastening; that is, bonding is a word with a more specific, narrower meaning than fastening:

Other hyponyms of fastening include soldering, doweling, earthing, grounding, linkage, ligature, tying, welding, fixation.

fastening (noun)	bonding (noun)
the act of fastening things together	fastening firmly together
restraint that attaches to something or holds something in place	(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
	a close personal relationship that forms between people (as between husband and wife or parent and child)