able vs central

able

adj
  • Having the necessary powers or the needed resources to accomplish a task. 

  • Gifted with skill, intelligence, knowledge, or competence. 

  • Legally qualified or competent. 

  • Free from constraints preventing completion of task; permitted to; not prevented from. 

  • Capable of performing all the requisite duties; as an able seaman. 

noun
  • The letter "A" in Navy Phonetic Alphabet. 

central

adj
  • Being very important, or key to something. 

  • Having or containing the centre of something. 

  • Being in the centre. 

  • Exerting its action towards the peripheral organs. 

noun
  • centre 

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