leathery turtle vs leatherback turtle

leathery turtle and leatherback turtle both are nouns.

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

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

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

Other synonyms of leathery turtle include Dermochelys coriacea, leatherback.

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