corneum vs horny layer

corneum and horny layer both are nouns.

Word	Noun	Adjective	Verb	Adverb
corneum	Yes	No	No	No
horny layer	Yes	No	No	No

As nouns, corneum and horny layer are synonyms defined as:

corneum and horny layer: the outermost layer of the epidermis consisting of dead cells that slough off

Other synonyms of corneum include stratum corneum.

corneum (noun)	horny layer (noun)
the outermost layer of the epidermis consisting of dead cells that slough off	the outermost layer of the epidermis consisting of dead cells that slough off