geochemistry vs chemistry

geochemistry and chemistry both are nouns.

Word	Noun	Adjective	Verb	Adverb
geochemistry	Yes	No	No	No
chemistry	Yes	No	No	No

As nouns, chemistry is a hypernym of geochemistry; that is, chemistry is a word with a broader meaning than geochemistry:

geochemistry: the chemistry of the earth's crust
chemistry: the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions

Other hypernyms of geochemistry include chemical science.

geochemistry (noun)	chemistry (noun)
the chemistry of the earth's crust	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
	the way two individuals relate to each other
	the chemical composition and properties of a substance or object