Your eyebrows are the lines of hair that grow above your eyes.
e.g. Michael furrowed his eyebrows in confusion.
e.g. Lisa spent hours in front of the mirror, plucking her eyebrows.
Your eyelids are the two pieces of skin that cover your eyes when they are closed.
e.g. He lifted one eyelid to see what she was doing.
eyelash /ˈaɪlæʃ/ (plural eyelashes)
Your eyelashes are the hairs that grow on the edges of your eyelids.
e.g. Maria smiled and fluttered her eyelashes at her boyfriend.
e.g. false eyelashes
Your elbow is the part of your arm where the upper and lower halves are joined.
e.g. Patricia grazed her elbow in the fall.
Your forearm is the part of your arm between your elbow and your wrist.
e.g. Betty has a tattoo on her forearm.
e.g. Michelle felt a sharp pain in her forearm.