rear vs sacrum

rear

noun
  • The buttocks or bottom. 

  • Specifically, the part of an army or fleet which comes last, or is stationed behind the rest. 

  • The back or hindmost part; that which is behind, or last in order. 

adv
  • early; soon 

verb
  • To construct by building; to set up 

  • To rise up on the hind legs 

  • To get angry. 

  • To raise spiritually; to lift up; to elevate morally. 

  • To move; stir. 

  • To place in the rear; to secure the rear of. 

  • To sodomize (perform anal sex) 

  • To breed and raise. 

  • To carve. 

  • To rise high above, tower above. 

  • To raise physically or metaphorically; to lift up; to cause to rise, to elevate. 

  • To bring up to maturity, as offspring; to educate; to instruct; to foster. 

adj
  • (of meats) Rare. 

  • (of eggs) Underdone; nearly raw. 

  • Being behind, or in the hindmost part; hindmost 

sacrum

noun
  • A large triangular bone at the base of the spine, located between the two ilia (wings of the pelvis) and formed from vertebrae that fuse in adulthood. 

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