List: word usually written using kana alone

usually written using kana alone  noun  noun (generic) 

• Anna's woodpecker (Calypte anna)

usually written using kana alone  noun  noun (generic) 

• Eurasian wryneck (Jynx torquilla)

usually written using kana alone  noun  noun (generic) 

• yellow-bellied sapsucker (Sphyrapicus varius)

usually written using kana alone  noun  noun (generic) 

• olivaceous piculet (species of bird, Picumnus olivaceus)

usually written using kana alone  noun  noun (generic) 

• northern flicker (species of bird, incl. the yellow-shafted flicker and the red-shafted flicker, Colaptes auratus)

usually written using kana alone  noun  noun (generic) 

• Japanese pilchard (Sardinops melanostictus), Japanese sardine

usually written using kana alone  noun  noun (generic) 

• Atlantic salmon (Salmo salmar)

usually written using kana alone  noun  noun (generic) 

• Pacific needlefish (Strongylura anastomella)

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

• pale chub (Zacco platypus), freshwater minnow

usually written using kana alone  noun  noun (generic) 

• stone moroko (Pseudorasbora parva), topmouth gudgeon