List: word usually written using kana alone

popular  obsolete kanji  JLPT N3  usually written using kana alone  noun  noun (generic)  noun (suffix) 

• thing, matter
• incident, occurrence, event, something serious, trouble, crisis
• circumstances, situation, state of affairs
• work, business, affair
• after an inflectable word, creates a noun phrase indicating something the speaker does not feel close to
• nominalizing suffix
• pretending to ..., playing make-believe ...
• alias, also known as, otherwise known as, or
• necessity, need
• you should ..., I advise that you ..., it's important to ...

popular  JLPT N1  noun  noun (generic)  noun (suffix)  usually written using kana alone  abbreviation  suffix 

• rise, increase, ascent
• income, takings, earnings, proceeds, (crop) yield, return, profit
• completion, end, finish
• end result (e.g. of crafts), how something comes out, finish
• finishing (in a board or card game, etc.)
• green tea (esp. in a sushi restaurant)
• after (rain, illness, etc.)
• ex- (e.g. ex-bureaucrat), former

popular  search-only kanji form  JLPT N4  noun  noun (generic)  adverb  usually written using kana alone  pronoun  Kansai-ben  archaic 

• inside, within
• while (e.g. one is young), during, within (e.g. a day), in the course of
• among, amongst, (out) of, between
• in (secret, chaos, poverty, etc.), amidst, with (e.g. success)
• within oneself, one's feelings, inner thoughts
• we, our company, our organization
• one's home, one's family
• my spouse, my husband, my wife
• signed on behalf of (husband's name) by his wife
• I, me
• imperial palace grounds
• emperor

popular  usually written using kana alone  expression 

• if you like

popular  obsolete kanji  irregular okurigana  JLPT N4  usually written using kana alone  noun  noun (generic)  adverb 

• good, advantage, benefit, welfare
• sake, purpose, objective, aim
• consequence, result, effect
• affecting, regarding, concerning

popular  JLPT N1  adverb  usually written using kana alone  interjection 

• what, how
• what (a) ...!, how ...!
• surprisingly, to my amazement, believe it or not, why, ...!
• oh my, wow
• well, ..., so, ...

popular  JLPT N3  noun  noun (generic)  usually written using kana alone  abbreviation  Internet  Internet slang 

• fishing, angling
• change (for a purchase)
• clickbaiting
• trolling, bait, making deliberately inflammatory posts online

popular  ateji  usually written using kana alone  noun  noun (generic) 

• club, fraternity, sorority, clubhouse

popular  noun  noun (generic)  noun or participle taking the aux. verb する  intransitive verb  usually written using kana alone  abbreviation 

• sidewise crawl (e.g. of a crab), crawling sideways
• leafhopper (insect), jassid
• sidewinder (Crotalus cerastes)
• levelling off (of prices, etc.), stabilizing

popular  JLPT N2  noun  noun (generic)  noun taking the genitive case particle の  adjective (generic)  usually written using kana alone 

• purple, violet
• purple gromwell (Lithospermum erythrorhizon), red gromwell, red-root gromwell
• soy sauce