P.E. vs elastic energy

P.E. and elastic energy both are nouns.

Word	Noun	Adjective	Verb	Adverb
P.E.	Yes	No	No	No
elastic energy	Yes	No	No	No

As nouns, elastic energy is a hyponym of P.E.; that is, elastic energy is a word with a more specific, narrower meaning than P.E.:

P.E.: the mechanical energy that a body has by virtue of its position; stored energy
elastic energy: potential energy that is stored when a body is deformed (as in a coiled spring)

Other hyponyms of P.E. include elastic potential energy, magnetic energy.

P.E. (noun)	elastic energy (noun)
the mechanical energy that a body has by virtue of its position; stored energy	potential energy that is stored when a body is deformed (as in a coiled spring)