Wyrm - A Dragon Species That Goes Back To The Old Days
of reading - words
Wyrm is derived from an old Germanic term. Dragon of the Roman draconem and / or Greek drakon (both of which mean snake) and Drake come from the same drakon through the Dutch word draak . Wyvern is essentially the same as it comes from an average English word meaning snake, wyver and probably comes from the same Latin root as the word viper.
Over time, traditions have changed things somewhat, especially the way these creatures play in heraldry. Wyverns are part of some family ridges and hold shields within these ridges. They are the only one of these four words to have a distinct definition in a standard dictionary. Because of heraldic rules, wyverns were given a specific and distinct definition legally in England from the 10th century onwards. Their specific and unique identity has been accepted and they are now considered a distinct creature by most people who know the word, while the other three are generally synonymous (unless otherwise indicated in the particular story or game in which they appear).
The Wyverns have two small wings and only two short legs (which look more like birds of prey than lizards, where, as in the tradition of Western Europe, dragons have larger bodies and wings and four legs (and that's how you tell them apart). There is a marine wyvern with a thicker, bearded tail, and a terrestrial fowl that generally has no barbed tail.