extreme vs rearmost

extreme

adj
  • Of a place, the most remote, farthest or outermost. 

  • Drastic, or of great severity. 

  • Of sports, difficult or dangerous; performed in a hazardous environment. 

  • Excessive, or far beyond the norm. 

  • In the greatest or highest degree; intense. 

noun
  • A drastic expedient. 

  • The greatest or utmost point, degree or condition. 

  • Either of the two numbers at the ends of a proportion, as 1 and 6 in 1:2=3:6. 

  • Each of the things at opposite ends of a range or scale. 

rearmost

adj
  • Furthest to the rear. 

  • The rearmost member of the strike team walked backward to guard them from a surprise attack from behind. 

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