toggle bolt vs holdfast

toggle bolt and holdfast both are nouns.

Word	Noun	Adjective	Verb	Adverb
toggle bolt	Yes	No	No	No
holdfast	Yes	No	No	No

As nouns, holdfast is a hypernym of toggle bolt; that is, holdfast is a word with a broader meaning than toggle bolt:

toggle bolt: a fastener consisting of a threaded bolt and a hinged spring-loaded toggle; used to fasten objects to hollow walls
holdfast: restraint that attaches to something or holds something in place

Other hypernyms of toggle bolt include fastener, fastening, fixing.

toggle bolt (noun)	holdfast (noun)
a fastener consisting of a threaded bolt and a hinged spring-loaded toggle; used to fasten objects to hollow walls	restraint that attaches to something or holds something in place