nuclear chemistry vs chemistry

nuclear chemistry and chemistry both are nouns.

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

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

nuclear chemistry: the chemistry of radioactive substances
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 nuclear chemistry include chemical science.

nuclear chemistry (noun)	chemistry (noun)
the chemistry of radioactive substances	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