Synonyms for Puff Adder (same or very similar meaning)
WordNet sense 1 (large African viper that inflates its body when alarmed):
Bitis arietansWordNet sense 2 (harmless North American snake with upturned nose; may spread its head and neck or play dead when disturbed):
hognose snake, sand viperFrom the ODE community, based on WordNetadd/edit