Synergism, or the process of working together, is often times applied to muscles in the body of an organism that have origins and insertions which allow for them to contract and affect the same area of the body in the same way. For example, the latissimus dorsi and the trapezius are considered synergists because they both have the ability to adduct the humerus. There are no other terms for this, other than PERHAPS sister muscles, or cooperating muscles.
cranium is the medical term
Mastoptosis is the medical term for sagging breast.
Thoracic is another medical term for pleural when used in the sense of naming the thoracic or pleural cavity.
Transdermal is another term meaning topical.
Inferior is the medical term meaning below; the medical terminology combining form is infra-.
Hemosiderosis is a close term to hemochromatosis. Iron overload is another name.
Hyperkinesia is the medical term meaning increased motor activity. Hyperactivity is another possible term.
Yes, deglutition is the medical term for swallowing.
Eyelashes is the most common term (Cili is the medical term for eyelashes).