law of volumes vs Charles's law

law of volumes and Charles's law both are nouns.

Word	Noun	Adjective	Verb	Adverb
law of volumes	Yes	No	No	No
Charles's law	Yes	No	No	No

As nouns, law of volumes and Charles's law are synonyms defined as:

law of volumes and Charles's law: (physics) the density of an ideal gas at constant pressure varies inversely with the temperature

Other synonyms of law of volumes include Gay-Lussac's law.

law of volumes (noun)	Charles's law (noun)
(physics) the density of an ideal gas at constant pressure varies inversely with the temperature	(physics) the density of an ideal gas at constant pressure varies inversely with the temperature