buttercup vs snookums

buttercup

noun
  • Affectionate or ironic term of address. 

  • Any of many herbs, of the genus Ranunculus, having yellow flowers; the crowfoot. 

  • Any flower of the genus Narcissus; a daffodil. 

snookums

noun
  • A term of endearment, especially for a child. 

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