congruent vs obstruent

congruent

adj
  • Having a difference divisible by a modulus. 

  • Harmonious. 

  • Satisfying a congruence relation. 

  • Coinciding exactly when superimposed. 

  • Corresponding in character; congruous 

obstruent

adj
  • Causing obstruction; blocking up. 

noun
  • A consonant sound formed by obstructing the airway, causing turbulence; a plosive, fricative, or affricate. 

  • Hypernym: consonant 

  • Anything that obstructs, especially in the passages of the body. 

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