leathery turtle vs leatherback

leathery turtle and leatherback both are nouns.

Word	Noun	Adjective	Verb	Adverb
leathery turtle	Yes	No	No	No
leatherback	Yes	No	No	No

As nouns, leathery turtle and leatherback are synonyms defined as:

leathery turtle and leatherback: wide-ranging marine turtle with flexible leathery carapace; largest living turtle

Other synonyms of leathery turtle include Dermochelys coriacea, leatherback turtle.

leathery turtle (noun)	leatherback (noun)
wide-ranging marine turtle with flexible leathery carapace; largest living turtle	wide-ranging marine turtle with flexible leathery carapace; largest living turtle