List: word usually written using kana alone

rarely used kanji form  usually written using kana alone  noun  noun (generic) 

• Japanese crayfish (Cambaroides japonicus)

usually written using kana alone  colloquial  noun  noun (generic) 

• crayfish (esp. red swamp crayfish, Procambarus clarkii)

usually written using kana alone  noun  noun (generic) 

• striped shore crab (Pachygrapsus crassipes)

usually written using kana alone  noun  noun (generic) 

• blue king crab (Paralithodes platypus)
• striped shore crab (Pachygrapsus crassipes)

usually written using kana alone  noun  noun (generic) 

• red-clawed crab (Chiromantes haematocheir)

usually written using kana alone  noun  noun (generic) 

• concave land hermit crab (Coenobita cavipes)

usually written using kana alone  noun  noun (generic) 

• porcelain crab (any decapod crustacean of family Porcellanidae)

search-only kana form  rarely used kanji form  noun  noun (generic)  derogatory  usually written using kana alone 

• red beard, person with a red beard
• Westerner
• Ryukyu robin (Erithacus komadori)

usually written using kana alone  noun  noun (generic) 

• grey wagtail (Motacilla cinerea), gray wagtail

usually written using kana alone  noun  noun (generic) 

• black woodpecker (Dryocopus martius)