List: word usually written using kana alone

gairaigo  Sanskrit origin  search-only kana form  search-only kanji form  Buddhism  noun  noun (generic)  usually written using kana alone  colloquial 

• Mara, demon king who attempted to hinder Gautama Buddha from attaining enlightenment
• obstacle to enlightenment
• penis

ateji  usually written using kana alone  な adjective  adjective (generic)  noun  noun (generic)  adverb taking the と particle 

• thoughtless, reckless, rash, indiscriminate, indiscreet
• excessive, unreasonable, immoderate, absurd

usually written using kana alone  noun  noun (generic)  archaic 

• pink (any flower of genus Dianthus, esp. the fringed pink, Dianthus superbus)
• lovable, caressable girl

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

• absurd

usually written using kana alone  な adjective  adjective (generic)  noun  noun (generic) 

• open, frank, outspoken, unreserved, straightforward, honest

colloquial  usually written using kana alone  な adjective  adjective (generic)  noun  noun (generic) 

• flat broke, stone broke, penniless

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

• to feign ignorance, to pretend not to know, to feign indifference, to assume a nonchalant air
• to assume a contemptuous attitude

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

• to hang one's head, to droop one's head

rarely used kanji form  search-only kanji form  usually written using kana alone  たる adjective  adjective (generic)  adverb taking the と particle 

• lively, vigorous, sprightly, animated, vivid

usually written using kana alone  noun  noun (generic) 

• dogtooth violet (Erythronium japonicum)