nonconductor vs bushing

nonconductor and bushing both are nouns.

Word	Noun	Adjective	Verb	Adverb
nonconductor	Yes	No	No	No
bushing	Yes	No	No	No

As nouns, bushing is a hyponym of nonconductor; that is, bushing is a word with a more specific, narrower meaning than nonconductor:

nonconductor: a material such as glass or porcelain with negligible electrical or thermal conductivity
bushing: an insulating liner in an opening through which conductors pass

Other hyponyms of nonconductor include mineral wool, rock wool, glass wool, ferroelectric material.

nonconductor (noun)	bushing (noun)
a material such as glass or porcelain with negligible electrical or thermal conductivity	a cylindrical metal lining used to reduce friction
	an insulating liner in an opening through which conductors pass