( ( A nuclide ) ( ( is ( ( a type ) ( of nucleus ) ) ) . ) )
(ROOT (S (NP (DT A) (NN nuclide)) (VP (VBZ is) (NP (NP (DT a) (NN type)) (PP (IN of) (NP (NN nucleus))))) (. .)))
A nuclide is a type of nucleus.
(ROOT (S (NP (NP (DT The) (JJ different) (NNS types)) (PP (IN of) (NP (NNS nuclei)))) (VP (VBP are) (VP (VBN referred) (S (VP (TO to))) (PP (IN as) (NP (NNS nuclides))))) (. .)))
The different types of nuclei are referred to as nuclides.