For food purposes, "massa" is the main ingredient of those dishes like noodles, pizza, spaghetti, gnocchi, lasagna and all that Italian stuff. (It is not the flour, it's that thing that looks like clay)
And you can call those dishes simply "Massa". "Comer massa".
For general purposes, "massa" means "mass".
What is a dough???
You'd better watch out which "massa" you're eating! The wrong kind can give you a tummy-ache...