She might, but the mother won't be able to feed her babies and the rats for very long, as rats need waaay more milk than mice. Plus, the rats could eventually hurt the mouse when they grow older.
No. Not the same species.
Females are does, males are stags, and babies are pups (although some breeders call them kittens, the scientific term is a pup).
rat pups
Ummm . . . yes, the baby rat is a rat, but maybe you mean what are they called . . . A baby rat is called a puppy or kitten, a female rat is called a doe, and a male rat is called a buck.
Not before the rat eats the mouse.
No. Same goes for every other living creature on this world.
a mouse
A rat is a rodent and it is bigger than a mouse. However the largest rodent is a capybara and that is the size of a pig.
You should not keep a rat and a mouse on the same cage together, The rat will most likely kill the mouse as that is their natural instinct.
If you mean what are they called, they are pups. Or pinkies.
Mouse House or Rat flat
giant rat