Snake type (8)
(Other definitions for anaconda that I've seen before include "Boa constrictor" , "Aquatic snake" , "Large semiaquatic snake" , "Water boa" , "Large snake of tropical S America" .)
(Other definitions for viper that I've seen before include "Malicious type" , "Malicious person" , "Deadly-venomous snake" , "crawler" , "poisonous type" .)