mound vs tump

mound

noun
  • An artificial hill or elevation of earth; a raised bank; an embankment thrown up for defense 

  • The mons veneris. 

  • Elevated area of dirt upon which the pitcher stands to pitch. 

  • A natural elevation appearing as if thrown up artificially; a regular and isolated hill, hillock, or knoll. 

  • A ball or globe forming part of the regalia of an emperor or other sovereign. It is encircled with bands, enriched with precious stones, and surmounted with a cross. 

verb
  • To form a mound. 

  • To force or pile into a mound or mounds. 

  • To fortify with a mound; add a barrier, rampart, etc. to. 

tump

noun
  • A mound or hillock. 

  • A tumpline. 

verb
  • To form a mass of earth or a hillock around. 

  • To fall over. 

  • To draw or drag, as a deer or other animal after it has been killed. 

  • to bump, knock (usually used with "over", possibly a combination of "tip" and "dump") 

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