cottar vs fastener

cottar and fastener both are nouns.

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

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

cottar: fastener consisting of a wedge or pin inserted through a slot to hold two other pieces together
fastener: restraint that attaches to something or holds something in place

Other hypernyms of cottar include fastening, fixing, holdfast.

cottar (noun)	fastener (noun)
fastener consisting of a wedge or pin inserted through a slot to hold two other pieces together	restraint that attaches to something or holds something in place
a peasant farmer in the Scottish Highlands	a person who fastens or makes fast