( Sun ( Star - ) )
(ROOT (NP (NNP Sun) (NNP Star) (: -)))
Sun Star -
(ROOT (S (NP (DT The) (NN sun)) (VP (VBZ is) (VP (VBN classified) (PP (IN as) (NP (DT a) (NN star))))) (. .)))
The sun is classified as a star.