crystal vs silicon oxide

crystal and silicon oxide both are nouns.

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

crystal (noun)	silicon oxide (noun)
a protective cover that protects the face of a watch	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
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