bother vs niggle

bother

noun
  • Trouble, inconvenience. 

  • Fuss, ado. 

intj
  • A mild expression of annoyance. 

verb
  • To do something which is of negligible inconvenience. 

  • To feel care or anxiety; to make or take trouble; to be troublesome. 

  • To annoy, to disturb, to irritate. 

niggle

noun
  • A minor complaint or problem. 

verb
  • To use, spend, or do in a petty or trifling manner. 

  • To dwell too much on minor points or on trifling details. 

  • To fidget, fiddle, be restless. 

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