vitreous silica vs quartz glass

vitreous silica and quartz glass both are nouns.

Word	Noun	Adjective	Verb	Adverb
vitreous silica	Yes	No	No	No
quartz glass	Yes	No	No	No

As nouns, vitreous silica and quartz glass are synonyms defined as:

vitreous silica and quartz glass: colorless glass made of almost pure silica

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

vitreous silica (noun)	quartz glass (noun)
colorless glass made of almost pure silica	colorless glass made of almost pure silica