Synonyms for Blacksnake (same or very similar meaning)
WordNet sense 1 (large harmless shiny black North American snake):
black rat snake, Elaphe obsoleta, mountain blacksnake, pilot blacksnakeWordNet sense 2 (blackish racer of the eastern United States that grows to six feet):
black racer, Coluber constrictorFrom the ODE community, based on WordNetadd/edit