to-come vs upcoming

to-come

noun

  • Something which is to come. 

  • The future. 

upcoming

noun

  • The act of coming up. 

  • comeuppance; deserts 

  • The activity of to upcome 

adj

  • Happening or appearing in the relatively near future. 

  • Eggcorn of up-and-coming. 

  • Pertaining to to upcome 

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