the four feathers is definitely horse feathers , 
(ROOT (S (NP (DT the) (CD four) (NNS feathers)) (VP (VBZ is) (ADVP (RB definitely)) (NP (NN horse) (NNS feathers))) (, ,)))
(ROOT (S (NP (DT ) (CD ) (NNS )) (VP (VBZ ) (ADVP (RB )) (NP (NN ) (NNS ))) (, )))