( ( Niagara Falls ) ( ( is ( ( the set ) ( of ( ( large waterfalls ) ( on ( the ( Niagara River ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Niagara) (NNP Falls)) (VP (VBZ is) (NP (NP (DT the) (NN set)) (PP (IN of) (NP (NP (JJ large) (NNS waterfalls)) (PP (IN on) (NP (DT the) (NNP Niagara) (NNP River))))))) (. .)))
Niagara Falls is the set of large waterfalls on the Niagara River.
(ROOT (S (NP (NNP Iguassu) (NNP falls)) (VP (VBZ is) (NP (NP (DT the) (JJS largest) (NN waterfall)) (PP (IN on) (NP (DT the) (NN planet))))) (. .)))