Which of the following terms belongs in a different group? femoral pelvic patellar axillary

The term that does belongs to a different group is Patella
Femoral, pelvic and axillary are veins in the body; The patellar is a tendon attaches the bottom of the kneecap (patella) to the top of the shinbone(tibia). It is a ligament that connects to two different bones, the patella and tibia. Patella bone is attached to the quadriceps muscles by the quadriceps tendon. 

Magma  is composed of molten rock and is  stored  in the earth's crust. lava is  magma  that reaches the surface of our planet through a volcano vent.

Scissors and a seesaw both cut things that’s the only comparison