albuminoid vs keratin

albuminoid and keratin both are nouns.

Word	Noun	Adjective	Verb	Adverb
albuminoid	Yes	No	No	No
keratin	Yes	No	No	No

As nouns, keratin is a hyponym of albuminoid; that is, keratin is a word with a more specific, narrower meaning than albuminoid:

albuminoid: a simple protein found in horny and cartilaginous tissues and in the lens of the eye
keratin: a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves

Other hyponyms of albuminoid include collagen, elastin, gelatin, gelatine, chondrin, ceratin.

albuminoid (noun)	keratin (noun)
a simple protein found in horny and cartilaginous tissues and in the lens of the eye	a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves