silica vs oxide

silica and oxide both are nouns.

Word	Noun	Adjective	Verb	Adverb
silica	Yes	No	No	No
oxide	Yes	No	No	No

As nouns, oxide is a hypernym of silica; that is, oxide is a word with a broader meaning than silica:

silica: 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
oxide: any compound of oxygen with another element or a radical

silica (noun)	oxide (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	any compound of oxygen with another element or a radical