Word usually written using kana alone

Chinese soft-shelled turtle (Pelodiscus sinensis); soft-shelled turtle (Trionychidae)

すっぽん only

trap door located on the walkway in a kabuki theatre

すっぽん only

bilge pump (used on traditional Japanese ships)

tortoiseshell (of the hawksbill turtle); bekko

In chinese medicine

tortoiseshell (esp. of the Chinese soft-shelled turtle)

Idiomatic expression

two things that are superficially similar but completely different; night and day; chalk and cheese; the Moon and a turtle

hard candy; candy suckers molded on a griddle; tortoise-shell candy

spider wasp; pompilid

amber (colour, color)

article of tortoise shell; tortoiseshell work

Lethocerus deyrollei (species of giant water bug)

Word usually written using kana alone

chiton (any marine mollusk of the class Polyplacophora); sea cradle

Japanese chiton (Acanthopleura japonica)