( We ( ( call ( ( ( the ( stored energy ) ) , ) ( potential energy ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (NP (DT the) (JJ stored) (NN energy)) (, ,) (NP (JJ potential) (NN energy)))) (. .)))
We call the stored energy, potential energy.
(ROOT (S (NP (NP (DT The) (NN energy)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN stored) (PP (IN in) (NP (NN matter)))))))) (VP (VBZ is) (VP (VBN called) (NP (NN potential)))) (. .)))