valency vs chemistry

valency and chemistry both are nouns.

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

valency (noun)	chemistry (noun)
(chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent)	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
(biology) a relative capacity to unite or react or interact as with antigens or a biological substrate	the way two individuals relate to each other
the phenomenon of forming chemical bonds	the chemical composition and properties of a substance or object