congregate vs reunify

congregate

verb
  • To come together; to assemble; to meet. 

  • To collect into an assembly or assemblage; to bring into one place, or into a united body. 

adj
  • Collective; assembled; compact. 

reunify

verb
  • To unify again; to bring back together, or come back together, after separation. 

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