List: word usually written using kana alone

usually written using kana alone  noun  noun (generic) 

• barn owl (Tyto alba)

usually written using kana alone  noun  noun (generic) 

• snowy owl (Bubo scandiacus)

usually written using kana alone  noun  noun (generic) 

• pillbug, pill bug, woodlouse, sowbug, sow bug, slater

usually written using kana alone  noun  noun (generic) 

• any shark of genus Centrophorus (esp. the dwarf gulper shark, Centrophorus atromarginatus)

usually written using kana alone  noun  noun (generic) 

• spiny dogfish (Squalus acanthias)

usually written using kana alone  noun  noun (generic) 

• spiny dogfish (Squalus acanthias)

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

• basking shark (Cetorhinus maximus)

usually written using kana alone  noun  noun (generic) 

• thresher shark (esp. the common thresher shark, Alopias vulpinus)

usually written using kana alone  noun  noun (generic) 

• bluntnose sixgill shark (Hexanchus griseus)

usually written using kana alone  noun  noun (generic) 

• Japanese angel shark (Squatina japonica)