insulator vs nonconductor

insulator and nonconductor both are nouns.

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

As nouns, insulator and nonconductor are synonyms defined as:

insulator and nonconductor: a material such as glass or porcelain with negligible electrical or thermal conductivity

Other synonyms of insulator include dielectric.

insulator (noun)	nonconductor (noun)
a material such as glass or porcelain with negligible electrical or thermal conductivity	a material such as glass or porcelain with negligible electrical or thermal conductivity