Hip and Loin

Hip noun - The quality or state of being fashionable.

Loin and hip are semantically related In some cases you can use "Loin" instead a noun "Hip".

Loin noun - Either side of the backbone between the hipbone and the ribs in humans as well as quadrupeds.

Hip and loin are semantically related in upper legs topic. You can use "Hip" instead a noun "Loin", if it concerns topics such as haunch of an animate being.