quartz glass vs vitreous silica

quartz glass and vitreous silica both are nouns.

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

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

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

Other synonyms of quartz glass include crystal, lechatelierite, quartz.

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