kinetic theory of gases vs kinetic theory

kinetic theory of gases and kinetic theory both are nouns.

Word	Noun	Adjective	Verb	Adverb
kinetic theory of gases	Yes	No	No	No
kinetic theory	Yes	No	No	No

As nouns, kinetic theory of gases and kinetic theory are synonyms defined as:

kinetic theory of gases and kinetic theory: (physics) a theory that gases consist of small particles in random motion

kinetic theory of gases (noun)	kinetic theory (noun)
(physics) a theory that gases consist of small particles in random motion	(physics) a theory that gases consist of small particles in random motion