AC vs electrical energy

AC and electrical energy both are nouns.

Word	Noun	Adjective	Verb	Adverb
AC	Yes	No	No	No
electrical energy	Yes	No	No	No

As nouns, electrical energy is a hypernym of AC; that is, electrical energy is a word with a broader meaning than AC:

AC: an electric current that reverses direction sinusoidally
electrical energy: energy made available by the flow of electric charge through a conductor

Other hypernyms of AC include electricity, power.

AC (noun)	electrical energy (noun)
an electric current that reverses direction sinusoidally	energy made available by the flow of electric charge through a conductor