law of conservation of energy vs first law of thermodynamics

law of conservation of energy and first law of thermodynamics both are nouns.

Word	Noun	Adjective	Verb	Adverb
law of conservation of energy	Yes	No	No	No
first law of thermodynamics	Yes	No	No	No

As nouns, law of conservation of energy and first law of thermodynamics are synonyms defined as:

law of conservation of energy and first law of thermodynamics: the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes

Other synonyms of law of conservation of energy include conservation of energy.

law of conservation of energy (noun)	first law of thermodynamics (noun)
the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes	the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes