energy state vs energy level

energy state and energy level both are nouns.

Word	Noun	Adjective	Verb	Adverb
energy state	Yes	No	No	No
energy level	Yes	No	No	No

As nouns, energy state and energy level are synonyms defined as:

energy state and energy level: a definite stable energy that a physical system can have; used especially of the state of electrons in atoms or molecules

energy state (noun)	energy level (noun)
a definite stable energy that a physical system can have; used especially of the state of electrons in atoms or molecules	a definite stable energy that a physical system can have; used especially of the state of electrons in atoms or molecules