Linguistically, many languages have overlap between words for 'snake' and 'dragon'. The word 'serpent' is useful for describing magical snakelike animals, as it includes real snakes alongside mythological ones, and many dragons can be classed as serpents. In English, there is no overlap between 'snake' (real squamate reptile: legless, sheds skin in one piece) and 'dragon' (fantasy creature), but this article is here to point out instances where 'snake' and 'dragon' overlap.
Python[]
Greek mythology, oracle
Naga and Naja[]
Many cobras are in the genus Naja, which is derrived from the word 'naga'.
Vipers and Wyverns[]
French Mythology > Vouivre, Wyvern
Welsh Mythology > Gwiber
Zmeu, Zmiya, Zmeya and Zmey[]
Russian and Slavic linguistic discussion: when is it a snake, when is it a dragon?
Snakes becoming dragons[]
Find that arabian source about a snake becoming an azidaja after 100 years
"do not spite the serpent, for who is to say he will not grow horns and become a dragon" -who said this?
Adders become gwiberod when they drink milk
Dragon Snakes[]
Xenodermis dragon snake