List: word usually written using kana alone

popular  rarely used kanji form  JLPT N4  noun  noun (generic)  usually written using kana alone 

• neck
• head
• dismissal (from a job), firing, sacking

popular  noun  noun (generic)  usually written using kana alone  go (game) 

• growth, development
• stretching (one's body, e.g. when waking up)
• (ability to) spread (of paint, cream, etc.)
• elongation, extension, carry (e.g. of sound), sustain
• nobi, solid extension, thick extension

popular  JLPT N5  noun  noun (generic)  derogatory  usually written using kana alone  noun (prefix) 

• dog (Canis (lupus) familiaris), canine
• squealer, rat, snitch, informer, informant, spy
• loser, asshole
• counterfeit, inferior, useless, wasteful

popular  JLPT N5  usually written using kana alone  noun  noun (generic) 

• (place) near by, (place) close by, (place) right next to, the side (of something), beside, vicinity, proximity, neighbourhood (neighborhood)
• as soon as, right after

popular  rarely used kanji form  JLPT N3  usually written using kana alone  adverb 

• already
• previously, before
• undeniably, unmistakably, in the first place

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

• hill, height, knoll, rising ground
• bonus points awarded to the winner at the end of a game

popular  search-only kanji form  JLPT N3  noun  noun (generic)  abbreviation  usually written using kana alone 

• cherry tree, cherry blossom, sakura
• light pink
• fake buyer, paid audience, shill, seat filler
• hired applauder
• horse meat

popular  JLPT N3  usually written using kana alone  expression  adverb  noun or participle taking the aux. verb する  verb (generic)  noun (generic)  transitive verb  intransitive verb 

• something, something or other, so-and-so
• somehow, anyhow, one way or another

popular  search-only kanji form  JLPT N5  usually written using kana alone  noun  noun (generic)  pronoun  adverb 

• everyone, everybody, all
• everything, all

popular  irregular okurigana  JLPT N1  usually written using kana alone  adverb  conjunction  formal or literary term 

• still, yet
• more, still more, greater, further
• furthermore, in addition, moreover, note that ...
• as if, just like, as though