Synovitis and Tendosynovitis

Synovitis noun - Inflammation of the synovial membrane that lines a synovial joint; results in pain and swelling.

Tendosynovitis and synovitis are semantically related. In some cases you can replace term "Tendosynovitis" with "Synovitis", this nouns are similar.

Tendosynovitis noun - Inflammation of a tendon and its enveloping sheath.

Synovitis and tendosynovitis are semantically related. You can use "Synovitis" instead a noun "Tendosynovitis".