allowable vs obstruent

allowable

adj
  • Able to be added or deducted in consideration of something. 

  • Appropriate; satisfactory; acceptable. 

  • Intellectually admissible; valid; probable. 

  • Permissible; tolerable; legitimate. 

noun
  • permitted amount or activity. 

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 allowable and obstruent occurred in a corpus of books? (source: Google Ngram Viewer )