isochronous vs spasmodic

isochronous

adj
  • Happening at regular intervals; isochronal. 

  • Happening at the same time; simultaneous. 

  • of or pertaining to data associated with time-sensitive applications. 

  • Of or pertaining to the use of clocks derived from the same clock reference. 

spasmodic

adj
  • Intermittent or fitful; occurring in abrupt bursts. 

  • Convulsive; consisting of spasms. 

  • Of or relating to a spasm; resembling a sudden contraction of the muscles. 

  • Erratic or unsustained. 

  • Of or relating to the spasmodic poets, a group of British Victorian poets who wrote introspective drama in verse. 

noun
  • A medicine for suppressing spasms. 

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