concern vs thread

concern

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. 

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. 

thread

noun
  • A continued theme or idea. 

  • A sequence of connections. 

  • A filament, as of a flower, or of any fibrous substance, as of bark. 

  • A long, thin and flexible form of material, generally with a round cross-section, used in sewing, weaving or in the construction of string. 

  • A screw thread. 

  • A unit of execution, lighter in weight than a process, usually sharing memory and other resources with other threads executing concurrently. 

  • The line midway between the banks of a stream. 

  • A series of messages, generally grouped by subject, in which all messages except the first are replies to previous messages in the thread. 

  • Composition; quality; fineness. 

verb
  • To put thread through. 

  • To remove the hair using a thread. 

  • To pass (through a narrow constriction or around a series of obstacles). 

  • To screw on; to fit the threads of a nut on a bolt. 

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