( Hookworm ( ( is ( ( an ( intestinal parasite ) ) ( of humans ) ) ) . ) )
(ROOT (S (NP (NNP Hookworm)) (VP (VBZ is) (NP (NP (DT an) (JJ intestinal) (NN parasite)) (PP (IN of) (NP (NNS humans))))) (. .)))
Hookworm is an intestinal parasite of humans.
(ROOT (S (NP (DT A) (NN hookworm)) (VP (VBZ is) (VP (VBN classified) (PP (IN as) (NP (DT a) (NN parasite))))) (. .)))
A hookworm is classified as a parasite.