( Tributary ( ( A stream ) ( ( draining ( into ( a ( larger stream ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Tributary)) (NP (DT A) (NN stream)) (VP (VBZ draining) (PP (IN into) (NP (DT a) (JJR larger) (NN stream)))) (. .)))
Tributary A stream draining into a larger stream.
(ROOT (S (NP (NNS Tributaries)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (JJ small) (NNS streams))))) (. .)))
Tributaries is the term for small streams.