cor- vs iso-

cor-

prefix
  • prerhotic form of con- 

iso-

prefix
  • Isomorphism. 

  • Equal; equivalent. 

  • Forms terms for specific kinds of isolines. 

  • Isomer. 

  • Same, identical. 

  • (of an aliphatic compound, especially a fatty acid) Having a branch on the penultimate carbon atom of a chain. 

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