basic vs surd

basic

adj
  • Unremarkable or uninteresting; boring; uncool. 

  • Elementary, simple, fundamental, merely functional. 

  • Of or pertaining to a base; having a pH greater than 7. 

  • Necessary, essential for life or some process. 

noun
  • An elementary building block, e.g. a fundamental piece of knowledge. 

  • A necessary commodity, a staple requirement. 

  • Basic training. 

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 basic and surd occurred in a corpus of books? (source: Google Ngram Viewer )