crystal vs quartz glass

crystal and quartz glass both are nouns.

Word	Noun	Adjective	Verb	Adverb
crystal	Yes	No	No	No
quartz glass	Yes	No	No	No

As nouns, crystal and quartz glass are synonyms defined as:

Other synonyms of crystal include lechatelierite, quartz, vitreous silica.

crystal (noun)	quartz glass (noun)
a protective cover that protects the face of a watch	colorless glass made of almost pure silica
glassware made of quartz
a crystalline element used as a component in various electronic devices
a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces
a solid formed by the solidification of a chemical and having a highly regular atomic structure
colorless glass made of almost pure silica