grounding vs fastening

grounding and fastening both are nouns.

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

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

Other hypernyms of grounding include attachment.

grounding (noun)	fastening (noun)
fastening electrical equipment to earth	the act of fastening things together
education or instruction in the fundamentals of a field of knowledge	restraint that attaches to something or holds something in place