Thornback vs Dorn - What's the difference?

As nouns the difference between thornback and dorn

is that thornback is any animal with a thorny back, especially marine animals, such as while dorn is a British ray; the thornback.

(wikipedia thornback)

(en noun)

Any animal with a thorny back, especially marine animals, such as:

# The (thornback guitarfish) (), a species of ray in the north-eastern Pacific Ocean.

# The (thornback ray) or (thornback skate) (), a species of ray in the Atlantic Ocean.

# The (thornback skate) (), a fish endemic to Australia.

(en noun)

A British ray; the thornback.

(Webster 1913) ----