leatherback vs leathery turtle

leatherback and leathery turtle both are nouns.

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

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

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

Other synonyms of leatherback include Dermochelys coriacea, leatherback turtle.

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