hassle vs nag

hassle

verb
  • To trouble, to bother, to annoy. 

  • To engage in a mock dogfight. 

  • To pick a fight or start an argument with. 

noun
  • Trouble, bother, unwanted annoyances or problems. 

  • A fight or argument. 

  • An action which is not worth the difficulty involved. 

adj
  • hassling; hasslesome 

nag

verb
  • To repeatedly remind or complain to (someone) in an annoying way, often about insignificant or unnecessary matters. 

  • To bother with persistent thoughts or memories. 

  • Anyone would think that I nagged at you, Amanda! (From Amanda! by Robin Klein) 

  • a nagging pain in his left knee 

  • The notion that he forgot something nagged him the rest of the day. 

  • To bother or disturb persistently in any way. 

noun
  • Someone or something that nags. 

  • A persistent, bothersome thought or worry. 

  • An old, useless horse. 

  • A repeated complaint or reminder. 

  • A small horse; a pony. 

How often have the words hassle and nag occurred in a corpus of books? (source: Google Ngram Viewer )