defective vs subnormal

defective

noun
  • A person or thing considered to be defective. 

  • A word written without matres lectionis (letters indicating vowels). 

adj
  • Not capable of representing all the phonemic distinctions of a language it is used to write. 

  • Spelled without matres lectionis, for example אמץ (ómets, “courage”) as opposed to the plene spelling אומץ where the letter vav ⟨ו⟩ indicates the vowel o. 

  • Lacking some forms; e.g., having only one tense or being usable only in the third person. 

  • Having one or more defects. 

  • Having a root whose final consonant is weak (ي, و, or ء). 

adv
  • Without matres lectionis (letters indicating vowels) written out. 

subnormal

noun
  • A person whose abilities are less than normal. 

  • That part of the axis of a curved line which is intercepted between the ordinate and the normal. 

adj
  • denormal 

  • Less than normal. 

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