( weight ( ( ( is just ) ( ( another word ) ( for ( ( the force ) ( of gravity ) ) ) ) ) . ) )
(ROOT (S (NP (NN weight)) (VP (VBZ is) (ADVP (RB just)) (NP (NP (DT another) (NN word)) (PP (IN for) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NN gravity))))))) (. .)))
weight is just another word for the force of gravity.
(ROOT (S (NP (NNP Weight)) (VP (VBZ is) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NN gravity))))) (. .)))