skin vs melanin

skin and melanin both are nouns.

Word	Noun	Adjective	Verb	Adverb
skin	Yes	No	Yes	No
melanin	Yes	No	No	No

skin (noun)	melanin (noun)
body covering of a living animal	insoluble pigments that account for the color of e.g. skin and scales and feathers
an outer surface (usually thin)
a bag serving as a container for liquids; it is made from the hide of an animal
a natural protective body covering and site of the sense of touch
the rind of a fruit or vegetable
a member of any of several British or American groups consisting predominantly of young people who shave their heads; some engage in white supremacist and anti-immigrant activities and this leads to the perception that all skinheads are racist and violent
a person whose head is bald or shaved
a person's skin regarded as their life

skin (verb)	melanin (verb)
remove the skin from
remove the bark of a tree
bruise, cut, or injure the skin or the surface of
climb awkwardly, as if by scrambling