silicon oxide vs silex

silicon oxide and silex both are nouns.

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

As nouns, silex is a hyponym of silicon oxide; that is, silex is a word with a more specific, narrower meaning than silicon oxide:

silicon oxide: 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
silex: a pure form of finely ground silica

Other hyponyms of silicon oxide include chert, flint.

silicon oxide (noun)	silex (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 pure form of finely ground silica