nostalgia vs soppiness

nostalgia

noun
  • A bittersweet yearning for the things of the past. 

  • A longing for home or familiar surroundings; homesickness. 

soppiness

noun
  • The state or condition of being soppy; oversentimentality. 

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