silicon oxide vs crystal

silicon oxide and crystal both are nouns.

Word	Noun	Adjective	Verb	Adverb
silicon oxide	Yes	No	No	No
crystal	Yes	No	No	No

silicon oxide (noun)	crystal (noun)
a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite	a protective cover that protects the face of a watch
	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