List: word usually written using kana alone

rarely used kanji form  usually written using kana alone  particle 

• only, just
• (ever) since, after
• continuously, remaining (in a particular state)

usually written using kana alone  noun  noun (generic) 

• chest, coffer
• rice tub, lidded round, wooden container for cooked rice

usually written using kana alone  adverb taking the と particle 

• unhurriedly, leisurely, slowly, relaxedly, taking one's time

usually written using kana alone  noun  noun (generic) 

• purple puffer (Takifugu porphyreus)

usually written using kana alone  noun  noun (generic) 

• bluespotted boxfish (Ostracion immaculatus)
• boxfish (any fish of family Ostraciidae), trunkfish

usually written using kana alone  noun  noun (generic) 

• murrelet (esp. the ancient murrelet, Synthliboramphus antiquus)
• roundbelly cowfish (Lactoria diaphana)

usually written using kana alone  noun  noun (generic) 

• great auk (Pinguinus impennis)

usually written using kana alone  noun  noun (generic) 

• dovekie (Alle alle), dovekey, little auk

usually written using kana alone  noun  noun (generic) 

• black guillemot (Cepphus grylle), tystie

usually written using kana alone  noun  noun (generic) 

• razorbill (Alca torda)