List: word usually written using kana alone

usually written using kana alone  な adjective  adjective (generic) 

• useless, vain, aimless, idle

usually written using kana alone  expression  adverb 

• since some time or another, since who-knows-when

usually written using kana alone  noun  noun (generic) 

• Japanese mountain ash (Sorbus japonica), Japanese whitebeam

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

• to wither (esp. plants as winter draws near), to fade, to shrivel
• to pass one's prime, to start deteriorating, to begin to decline

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

• not funny, not a laughing matter, not a joke

usually written using kana alone  noun  noun (generic) 

• hyuganatsu (species of citrus, Citrus tamurana)

usually written using kana alone  noun  noun (generic) 

• raigan (Omphalia lapidescens), parasitic fungus which grows on bamboo, used in Chinese medicine

usually written using kana alone  noun  noun (generic) 

• lima bean (Phaseolus lunatus), butter bean

usually written using kana alone  noun  noun (generic) 

• Phacelurus latifolius (species of perennial grass)

noun  noun (generic)  usually written using kana alone 

• call of a wild goose
• wild goose (esp. a lesser white-fronted goose, Anser erythropus)
• tea made from twigs of high-quality tea plants (esp. gyokuro), high-grade kukicha (esp. from gyokuro)