insulator vs dielectric

insulator and dielectric both are nouns.

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

As nouns, insulator and dielectric are synonyms defined as:

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

Other synonyms of insulator include nonconductor.

insulator (noun)	dielectric (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