List: word usually written using kana alone

usually written using kana alone  noun  noun (generic)  colloquial 

• tiger beetle (esp. the Japanese tiger beetle, Cicindela japonica)
• blister beetle, oil beetle

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

• Japanese grosbeak (Eophona personata)

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

• red-banded sand wasp (Ammophila sabulosa)
• thread-waisted wasp (any wasp of family Sphecidae, incl. digger wasps and mud daubers)

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

• sphagnum, peat moss, bog moss

usually written using kana alone  noun  noun (generic) 

• mizuna (Brassica rapa var. nipposinica), potherb mustard
• Elatostema umbellatum var. majus (variety of plant related to the nettles)

usually written using kana alone  noun  noun (generic) 

• whirligig beetle (any insect of family Gyrinidae, esp. the Japanese whirligig beetle, Gyrinus japonicus)
• pond skater, water strider

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

• water scorpion (Ranatra chinensis), water stick

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

• rail (any bird of family Rallidae, esp. the water rail, Rallus aquaticus)

usually written using kana alone  noun  noun (generic) 

• reason, circumstances, meaning

usually written using kana alone  い adjective  adjective (generic)  expression 

• easy, simple
• there's no way that ...