List: word usually written using kana alone

usually written using kana alone  noun  noun (generic) 

• common shelduck (Tadorna tadorna)

usually written using kana alone  noun  noun (generic) 

• red-whiskered bulbul (Pycnonotus jocosus)

usually written using kana alone  noun  noun (generic) 

• Eupatorium makinoi (species of boneset)

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

• Mediterranean mussel (Mytilus galloprovincialis)

usually written using kana alone  Ichidan verb  verb (generic)  intransitive verb  colloquial 

• to age, to get old, to go stale
• to be too grown-up (for one's age), to be precocious
• to become twisted, to become warped, to become perverse

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

• galingale (any plant of genus Cyperus, esp. species Cyperus microiria)
• nut grass (Cyperus rotundus)

usually written using kana alone  noun  noun (generic) 

• nut grass (Cyperus rotundus)

usually written using kana alone  noun  noun (generic) 

• Carex scabrifolia (species of sedge)

usually written using kana alone  noun  noun (generic) 

• Pacific island flatsedge (Cyperus cyperoides)

search-only kana form  noun  noun (generic)  mahjong  usually written using kana alone  go (game) 

• flying, leaping, flight, leap
• zero, naught, oh
• flying fish (esp. the Japanese flying fish, Cypselurus agoo)
• running out of points (zero or fewer), game ending due to a player running out of points
• jump