terpsikeraunos:

anguis: a serpent, snake; esp. in fable as an emblem: of terror, the snaky head of Medusa; of rage, the serpent-girdle of Tisiphone; of art and wisdom, the serpent-team of Medea

aspis: the asp, viper

coluber: a serpent, snake; of the Hydra; of Medusa; of Allecto

draco: a sort of serpent, a dragon; name of a constellation; in eccl. Lat., the Serpent, the Devil

hydrus: a water-serpent, serpent; or Hydros, the constellation of the Waterserpent, called also Anguis and Hydra

serpens: participle of serpo, a creeping thing, creeper, crawler, snake, serpent 

vipera: adder, snake, serpent, in gen.,—prov.: “in sinu viperam habere,” Cic. Har. Resp. 24, 50: “viperam nutricare sub alā,” to nourish a viper in one’s bosom