List: word usually written using kana alone

noun  noun (generic)  usually written using kana alone 

• birdlime
• Nepal holly (Ilex integra)

popular  usually written using kana alone  noun  noun (generic) 

• mold, mould, mildew

obsolete reading  usually written using kana alone  noun  noun (generic) 

• Chinese soft-shelled turtle (Pelodiscus sinensis), soft-shelled turtle (Trionychidae)
• trap door located on the walkway in a kabuki theatre
• bilge pump (used on traditional Japanese ships)

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

• weasel (esp. the Japanese weasel, Mustela itatsi)
• mustelid (any mammal of family Mustelidae)

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

• going round in circles, game of cat and mouse, pointless and repetitive back-and-forth
• itachi-gokko, Edo-period children's game in which two players alternately pinch the back of the other's hands and stack them on top of each other while saying "itachi-gokko, nezumi-gokko"

usually written using kana alone  noun  noun (generic) 

• frame (e.g. of film, panel in a comic, etc.)
• scene
• time block (e.g. of a class schedule)

usually written using kana alone  godan verb  godan verb (archaic)  verb (generic)  intransitive verb 

• to bite into, to sink one's teeth into
• to stick to, to cling to, to hold on to

rarely used kana form  rarely used kanji form  search-only kanji form  usually written using kana alone  adverb  adverb taking the と particle  noun or participle taking the aux. verb する  verb (generic)  noun (generic) 

• busily, sedulously, laboriously, feverishly, fussily, worrying (about little things)

obsolete kanji  usually written using kana alone  noun  noun (generic) 

• yew plum pine (Podocarpus macrophyllus)

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

• morning sickness, nausea and vomiting of pregnancy