The difference between Wyrm and Wyvern
When used as nouns, wyrm means a huge limbless and wingless serpent, whereas wyvern means a draconian creature possessing wings, only two legs and usually a barbed tail.
check bellow for the other definitions of Wyrm and Wyvern
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Wyrm as a noun (mythology):
A huge limbless and wingless serpent
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Wyrm as a noun (fantasy):
A vague term, but it usually refers to huge limbless and wingless serpents
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Wyrm as a noun (synonym):
A sea serpent
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Wyvern as a noun (heraldry, mythology, fantasy):
A draconian creature possessing wings, only two legs and usually a barbed tail.