Word Warp Anyone?

While we're waiting for our move to a private room, guess I'll take a minute to give you the word warp. Mom solved them all--after a cup of really strong coffee

taking    +
geometric +
physical   +            5     + ___________

train   +
car    +
nervous +             5    +____________

poop  +
stacked +
flight +                4    + _____________

Final answer       4       _____________