K.E. vs mechanical energy

K.E. and mechanical energy both are nouns.

Word	Noun	Adjective	Verb	Adverb
K.E.	Yes	No	No	No
mechanical energy	Yes	No	No	No

As nouns, mechanical energy is a hypernym of K.E.; that is, mechanical energy is a word with a broader meaning than K.E.:

K.E. (noun)	mechanical energy (noun)
the mechanical energy that a body has by virtue of its motion	energy in a mechanical form