hostile vs surd

hostile

adj
  • Unwilling. 

  • Of a hostile takeover. 

  • Aggressive; antagonistic. 

  • Not friendly; appropriate to an enemy; showing the disposition of an enemy; showing ill will and malevolence or a desire to thwart and injure. 

noun
  • An enemy. 

surd

adj
  • unvoiced; voiceless 

  • Involving surds, or irrational numbers; not capable of being expressed in rational numbers. 

noun
  • An irrational number, especially one expressed using the √ symbol. 

  • A voiceless consonant. 

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