lashing vs fastening

lashing and fastening both are nouns.

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

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

Other hypernyms of lashing include fastener, fixing, holdfast, rope.

lashing (noun)	fastening (noun)
beating with a whip or strap or rope as a form of punishment	the act of fastening things together
rope that is used for fastening something to something else	restraint that attaches to something or holds something in place

lashing (adjective)	fastening (adjective)
violently urging on by whipping or flogging