bleck vs pho

bleck

noun
  • Any black fluid substance, as in blacking for leather, or black grease. 

  • Coalfish (Pollachius virens). 

  • Soot, smut. 

pho

noun
  • A Vietnamese soup with a beef base, typically served with rice noodles and beef or chicken. 

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