List: word usually written using kana alone

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

• cattle egret (Bubulcus ibis)

usually written using kana alone  noun  noun (generic) 

• Schlegel's green tree frog (Rhacophorus schlegelii)

usually written using kana alone  noun  noun (generic) 

• forest green tree frog (Rhacophorus arboreus)

usually written using kana alone  noun  noun (generic) 

• dusky tripletooth goby (Tridentiger obscurus)

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

• freshwater goby (any fish of genus Rhinogobius)

usually written using kana alone  noun  noun (generic) 

• goatsbeard brotula (species of ophidiiform fish, Brotula multibarbata)

usually written using kana alone  noun  noun (generic) 

• dark sleeper (species of sleeper goby, Odontobutis obscura)

usually written using kana alone  noun  noun (generic) 

• fly swatter, flyswatter, fly swat

usually written using kana alone  noun  noun (generic) 

• pair (esp. of mated animals), brace, couple
• (anatomical) joint

usually written using kana alone  noun  noun (generic) 

• legless lizard (esp. Anguidae spp., incl. glass lizards and slow worms)