List: noun (common) (futsuumeishi)

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

• one person
• being alone, being by oneself
• being single, being unmarried
• by oneself, alone
• just, only, simply

popular  JLPT N4  noun  noun (generic) 

• sound, noise
• (musical) note
• fame

popular  JLPT N3  pronoun  colloquial  usually written using kana alone  noun  noun (generic)  adverb  interjection 

• what
• you-know-what, that thing
• whatsit, whachamacallit, what's-his-name, what's-her-name
• penis, (one's) thing, dick
• (not) at all, (not) in the slightest
• what?, huh?
• hey!, come on!
• oh, no (it's fine), why (it's nothing), oh (certainly not)

popular  gikun or jukujikun  JLPT N5  noun  noun (generic)  adverb 

• today, this day
• these days, recently, nowadays

popular  noun  noun (generic) 

• number, amount

popular  noun  noun (generic) 

• first half

popular  JLPT N2  noun  noun (generic) 

• Emperor of Japan

popular  JLPT N4  noun  noun (generic)  adverb 

• on the way, en route
• in the middle of, midway, halfway

popular  rarely used kanji form  JLPT N3  noun  noun (generic) 

• married couple, husband and wife, man and wife

popular  obsolete reading  JLPT N1  noun  noun (generic) 

• document, writing, letter, papers, notes, records, archives
• document addressed to someone