SOUTH PLATTE RIVER(noun)Did you mean?Synonyms RhymesDefinitions There is 1 meaning of the phrase South Platte River. South Platte River - as a noun A tributary of the platte river Synonyms (Exact Relations)south platteWord Variations & RelationsStarts SStarts SOStarts SOUStarts SOUTEnds REnds EREnds VEREnds IVERStarts S & ends RStarts SO & ends RStarts S & ends ERA-Z Proximitiessouterly11souterrain10souterrains11souters7south8 South Platte River south-centralsouth-eastsouth-polarsouth-southeastsouth-southwest