蟹

soldier crab (Mictyris brevidactylus)

stone crab

Ocypode stimpsoni (species of ghost crab, sand crab or white crab)

Japanese mitten crab (Eriocheir japonica)

Word usually written using kana alone

coconut crab (Birgus latro)

ヤシガニ only; Slang

horribly drawn animated TV-show

Asian shore crab (Hemigrapsus sanguineus)

red-clawed crab (Chiromantes haematocheir)

Astronomy

Crab Nebula

Colloquial

crayfish (esp. red swamp crayfish, Procambarus clarkii)

pea crab (any crab of the family Pinnotheridae)

Zosimus aeneus (species of poisonous crab)

common moon crab (Matuta victor)

Product name

Wanli Crab (brand name for crab caught in the Wanli district of Taiwan)

Sesarmops intermedium (species of grapsoid crab)

egg crab (Atergatis spp.)

Cancer japonicus (species of crab)

Paralomis histrix (species of king crab); porcupine crab

Food, cooking

boiled crab

spider crab (Cyclocoeloma tuberculatum)

Eplumula phalangium (crab species)

swimming crab (Ovalipes punctatus); sand crab

helmet crab (Telmessus acutidens)

flat rock crab (Percnon planissimum)

Ilyoplax pusilla (crab species)