List: word usually written using kana alone

usually written using kana alone  noun  noun (generic) 

• great spotted woodpecker (Dendrocopos major)

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

• any brown or reddish-brown frog of the family Ranidae
• Japanese brown frog (Rana japonica)

usually written using kana alone  noun  noun (generic) 

• starry handfish (Halieutaea stellata)

usually written using kana alone  noun  noun (generic)  colloquial 

• brown-headed thrush (Turdus chrysolaus)
• Japanese dace (Tribolodon hakonensis)
• Japanese fire belly newt (Cynops pyrrhogaster)
• dysentery

usually written using kana alone  noun  noun (generic) 

• Japanese evergreen oak (Quercus acuta)

usually written using kana alone  noun  noun (generic) 

• pickled sardines, dried sardines, red sardines
• rusty and blunt sword

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

• sponger (e.g. off one's parents), hanger-on, freeloader, leech

usually written using kana alone  noun  noun (generic) 

• spot-billed duck (Anas poecilorhyncha)

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

• yoke
• constraints, oppression

usually written using kana alone  adverb 

• so much