big-boned vs tubby

big-boned

adj
  • Of a person or animal: large but not obese. 

  • Fat, obese. 

tubby

noun
  • An overweight person. 

adj
  • Resembling a tub; sounding dull and without resonance or freedom of sound. 

  • stout, rotund 

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