lashing vs fastener

lashing and fastener both are nouns.

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

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

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

lashing (noun)	fastener (noun)
beating with a whip or strap or rope as a form of punishment	restraint that attaches to something or holds something in place
rope that is used for fastening something to something else	a person who fastens or makes fast

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