fat's scientific name is lipids.
another word for fattening is fat! it is easy to say that because it has fat in it Thanks for looking:):P
Another word for fat with 5 letters would be Obese. or over-the-top-horribly-obese
fat and chubby
ObeseMy Edit:Plump, Obese, Fat, Chubby
Fat, plump, heavy.