Rubor and Synovitis

Rubor noun - A response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat.

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

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

Rubor and synovitis are semantically related. You can use "Rubor" instead a noun "Synovitis".