( ( ( Diffusion -- ) ( ( the movement ) ( of ( ( a substance ) ( from ( ( an area ) ( of ( higher ( to ( lower concentrations ) ) ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NNP Diffusion)) (: --) (NP (NP (DT the) (NN movement)) (PP (IN of) (NP (NP (DT a) (NN substance)) (PP (IN from) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (NP (JJR higher)) (PP (TO to) (NP (JJR lower) (NNS concentrations)))))))))) (. .)))
Diffusion -- the movement of a substance from an area of higher to lower concentrations.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT the) (NN movement)) (PP (IN of) (NP (DT a) (NN substance)))) (PP (IN from) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (NP (DT a) (JJR higher) (NN amount)) (PP (IN toward) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (JJR lower) (NN amount) (NN diffusion)))))))))) (. .)))