melanin vs animal pigment

melanin and animal pigment both are nouns.

Word	Noun	Adjective	Verb	Adverb
melanin	Yes	No	No	No
animal pigment	Yes	No	No	No

As nouns, animal pigment is a hypernym of melanin; that is, animal pigment is a word with a broader meaning than melanin:

melanin: insoluble pigments that account for the color of e.g. skin and scales and feathers
animal pigment: pigment occurring in animals

melanin (noun)	animal pigment (noun)
insoluble pigments that account for the color of e.g. skin and scales and feathers	pigment occurring in animals