corpulence — fatness or stoutness of body; obesity
bulk — You can refer to something's bulk when you want to emphasize that it is very large.
chubbiness — round and plump: a chubby child; a chubby face.
fatness — the state or condition of being fat; obesity; corpulence.
overweight — weighing too much or more than is considered normal, proper, etc.: overweight luggage; an overweight patient; two letters that may be overweight.
paunchy — having a large and protruding belly; potbellied: a paunchy middle-aged man.
plumpness — well filled out or rounded in form; somewhat fleshy or fat.
stout — bulky in figure; heavily built; corpulent; thickset; fat: She is getting too stout for her dresses. Synonyms: big, rotund, stocky, portly, fleshy. Antonyms: thin, lean, slender, slim; skinny, scrawny.
portliness — rather heavy or fat; stout; corpulent.
