bellyband vs fastener

bellyband and fastener both are nouns.

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

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

bellyband: a strap around the belly of a draft animal holding the shafts of a wagon
fastener: restraint that attaches to something or holds something in place

Other hypernyms of bellyband include fastening, fixing, holdfast.

bellyband (noun)	fastener (noun)
a strap around the belly of a draft animal holding the shafts of a wagon	restraint that attaches to something or holds something in place
a cloth band that is worn around the waist (as on infants until the navel has healed)	a person who fastens or makes fast