concern vs interest

concern

verb
  • To engage by feeling or sentiment; to interest. 

  • To relate or belong to; to have reference to or connection with; to affect the interest of; to be of importance to. 

  • To make somebody worried. 

noun
  • The placement of interest or worry on a subject. 

  • The expression of solicitude, anxiety, or compassion toward a thing or person. 

  • That which affects one’s welfare or happiness. A matter of interest to someone. 

  • A worry; a sense that something may be wrong; an identification of a possible problem. 

  • A business, firm or enterprise; a company. 

  • Any set of information that affects the code of a computer program. 

interest

verb
  • To engage the attention of; to awaken interest in; to excite emotion or passion in, in behalf of a person or thing. 

noun
  • A great attention and concern from someone or something; intellectual curiosity. 

  • An involvement, claim, right, share, stake in or link with a financial, business, or other undertaking or endeavor. 

  • The price paid for obtaining, or price received for providing, money or goods in a credit transaction, calculated as a fraction of the amount or value of what was borrowed. 

  • Condition or quality of exciting concern or being of importance. 

  • Any excess over and above an exact equivalent 

  • The persons interested in any particular business or measure, taken collectively. 

  • Something or someone one is interested in. 

  • Attention that is given to or received from someone or something. 

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