The term WHITE RAT, E.G. can be solved by the crossword solution ALBINO, which is a 6 letter word. An albino is an organism with a congenital absence of pigment in the skin, hair, and eyes due to absence or defect of tyrosinase, an enzyme involved in the production of melanin. Albinism is most commonly found in mammals, including humans, but can also be found in other organisms such as fish, birds, and reptiles.