List: word usually written using kana alone

gikun or jukujikun  usually written using kana alone  noun  noun (generic)  archaic 

• mayfly
• ephemerality (of life)
• dragonfly

usually written using kana alone  noun  noun (generic) 

• praying mantis (esp. the narrow-winged mantis, Tenodera angustipennis)

usually written using kana alone  noun  noun (generic) 

• fourspine sculpin (species of fish, Cottus kazika)

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

• diaper, nappy
• swaddling clothes
• loincloth

irregular kanji usage  usually written using kana alone  noun  noun (generic) 

• fat greenling (Hexagrammos otakii)

usually written using kana alone  noun  noun (generic) 

• Chinese parasol-tree (Firmiana simplex), Chinese-bottletree, Japanese varnishtree, phoenix-tree

usually written using kana alone  noun  noun (generic) 

• Japanese rat snake (Elaphe climacophora)

usually written using kana alone  noun  noun (generic) 

• Manila clam (Ruditapes philippinarum), Japanese littleneck clam

usually written using kana alone  noun  noun (generic) 

• prickly heat, heat rash, miliaria

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

• opium