integumentary

As a letter s

is the letter s with a.

As an adjective integumentary is

of, related to, or composed of integuments.

As a noun skin

is (uncountable) the outer protective layer of the body of any animal, including of a human.

As a verb skin

is to injure the skin of.

As an adjective integumentary is

of, related to, or composed of integuments.