best vs foremost

best

adj
  • Most superior; most favorable. 

  • Most; largest. 

noun
  • The person (or persons; or thing or things) that is (are) most excellent. 

  • The supreme effort one can make, or has made. 

  • One's best behavior. 

verb
  • Had best. 

  • To surpass in skill or achievement. 

  • To beat in a contest. 

adv
  • To the most advantage; with the most success, cause, profit, benefit, or propriety. 

foremost

adj
  • Of the highest rank or position; of the greatest importance; of the highest priority. 

  • Positioned in front of (all) others in space, most forward. 

  • Coming before (all) others in time. 

  • Closest to the bow. 

adv
  • In front, prominently forward. 

  • First in time. 

  • Most importantly. 

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