albuminoid vs collagen

albuminoid and collagen both are nouns.

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

As nouns, collagen is a hyponym of albuminoid; that is, collagen 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
collagen: a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling

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

albuminoid (noun)	collagen (noun)
a simple protein found in horny and cartilaginous tissues and in the lens of the eye	a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling