ahead vs anterior

ahead

adv
  • To a later time. 

  • At an earlier time; beforehand; in advance. 

  • To an earlier time. 

  • In or for the future. 

  • At or towards the front; in the direction one is facing or moving. 

  • So as to be further advanced, either spatially or in an abstract sense. 

anterior

adj
  • Pronounced with an obstruction located in front of the palato-alveolar region of the mouth, e.g. b, p, d, t. 

  • (of a part of a flower or leaf) Situated further away from the mainstem. 

  • Nearer the forward end, especially in the front of the body; nearer the head or forepart of an animal. 

  • Coming before or earlier in time or development, prior to, preceding. 

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