affection vs concern

affection

noun
  • An emotion; a feeling or natural impulse acting upon and swaying the mind. 

  • The act of affecting or acting upon. 

  • The state of being affected, especially: a change in, or alteration of, the emotional state of a person or other animal, caused by a subjective affect (a subjective feeling or emotion), which arises in response to a stimulus which may result from either thought or perception. 

  • An attribute; a quality or property; a condition. 

  • A feeling of love or strong attachment. 

concern

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

  • The placement of interest or worry on a subject. 

  • 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. 

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. 

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