Final answer:
The lesser trochanter is a bony prominence on the femur that serves as a site for muscle attachments, while the greater trochanter is a large projection above the base of the neck on the femur.
Step-by-step explanation:
The lesser trochanter is a bony prominence that lies on the medial aspect of the femur, just below the neck. It serves as a site for muscle attachments. The greater trochanter, on the other hand, is a large, upward, bony projection located above the base of the neck. It can be felt just under the skin on the lateral side of the upper thigh. Both the greater and lesser trochanters are landmarks on the femur.