aftermost vs uttermost

aftermost

adj

  • Nearest the stern of a vessel. 

uttermost

adj

  • Outermost. 

  • Extreme; utmost; of the farthest, greatest, or highest degree. 

noun

  • The utmost; the highest or greatest degree; the farthest extent. 

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